Chocolate Mousse Cake I Food

LAYERED CHOCOLATE MOUSSE CAKE

Steps:

• For the brownie: Preheat the oven to 350 degrees F. Spray the bottom of a 9-inch springform pan with nonstick cooking spray.
• Whisk together the flour, cocoa powder and sugar in a medium bowl. Whisk in the milk, butter, vanilla and egg until smooth. Pour the batter into the prepared pan and bake until a knife inserted in the center comes out clean, about 20 minutes. Cool completely on a wire rack, about 30 minutes.
• Unclasp the pan, remove the outer ring and spray it with nonstick cooking spray. Line the ring with a 2 1/2-inch-wide parchment strip, making sure that it sits tightly and smoothly along the sides. Re-clasp the ring to the bottom of the pan with the cake in it.
• For the mousse: Roughly chop 4 tablespoons of the butter and put in a medium microwave-safe bowl. Microwave in 30-second intervals, stirring in between each, until melted, about 1 minute. Stir in 1/4 cup of the cocoa powder until smooth; set aside. Chop the remaining 8 tablespoons butter and put in a medium microwave-safe bowl. Microwave in 30-second intervals, stirring in between each, until melted, about 1 minute. Stir in the remaining 1/2 cup cocoa powder until smooth; set aside.
• Add 1/4 cup of the heavy cream to a small microwave-safe bowl and stir in the gelatin. Let sit for 5 minutes to bloom. Microwave in 30-second intervals, stirring in between each, until the gelatin is dissolved, about 1 minute. Cool to room temperature, about 5 minutes.
• Transfer the gelatin to the bowl of a stand mixer fitted with the whisk attachment and add the sugar, vanilla and remaining 3 3/4 cups heavy cream. Whisk on medium speed until stiff peaks form, 3 to 4 minutes. Divide the whipped cream mixture between 2 large bowls. Fold one bowl of the cocoa powder-butter mixture into each batch of whipped cream mixture and stir until no streaks remain (one bowl will contain dark chocolate mousse and the other will contain light chocolate mousse).
• Spread the dark chocolate mousse on top of the brownie in the springform pan. Use an offset spatula to even out and smooth the top. Spread the light chocolate mousse on top of the dark chocolate mousse and use an offset spatula to even out and smooth the top. Refrigerate until the mousse is set, 3 hours and up to overnight.
• For the ganache: Bring the heavy cream and butter to a boil in a small saucepan over medium-high heat. Put the semisweet chocolate in a large heatproof bowl and pour the hot cream over top. Let it sit for 5 minutes, then stir until smooth and shiny.
• Unclasp the springform pan and remove the parchment paper from the sides of the cake. Use a hot, dry offset spatula to smooth out the sides. Set a rack in a rimmed baking sheet and put the cake on top of the rack. Pour the ganache over the cake and let it drip down over the sides so the entire cake is covered. Swipe once across the top with a clean, large offset spatula to create a smooth top. Refrigerate until set, about 30 minutes.
• Hold a stencil or other tool with holes (such as a doily or a cooling rack) over the cake (do not lay it on the ganache; it will stick) and dust with more cocoa powder to create a decorative pattern. Serve immediately.

ALMOST-FAMOUS CHOCOLATE MOUSSE CAKE

Steps:

• Make the cake: Prepare the cake mix as the label directs for a 9-by-13-inch cake. Bake; cool slightly in the pan, then invert onto a rack to cool completely.
• Clean out the cake pan and line it with plastic wrap. Cut the cake in half lengthwise, then in thirds crosswise to make 6 rectangles. Using a serrated knife, slice each rectangle in half to make two layers. Arrange half of the pieces snugly in the cake pan. Crumble the remaining pieces and press tightly into 6 small balls; arrange 1 cake ball in the center of each cake rectangle in the pan.
• Make the mousse: Heat the chocolate, butter, coffee and 1/4 cup water in a heatproof bowl set over a saucepan of simmering water (do not let the bowl touch the water), stirring, until melted. Remove the bowl from the pan; stir until cool. Reserve the simmering water. Fill a large bowl with ice water.
• Whisk the egg yolks, 1 1/2 cups sugar and 2 tablespoons water in a separate large heatproof bowl. Set the bowl over the saucepan of simmering water and whisk until pale yellow, 6 to 8 minutes. Add the chocolate-coffee mixture and the vanilla and whisk until combined, about 2 minutes. Remove the bowl from the pan and set in the bowl of ice water; whisk until slightly cool but not thick, about 4 minutes.
• Beat the egg whites and salt in a bowl with a mixer until foamy. Add 2 tablespoons sugar and beat until almost stiff; gently fold into the chocolate-yolk mixture to make a dark chocolate mousse. Spread 5 cups over the cake and cake balls. Freeze until firm on top, about 30 minutes.
• Beat the heavy cream and the remaining 4 tablespoons sugar until soft peaks form; fold into the remaining mousse. Remove the cake from the freezer; spread with the light chocolate mousse, cover with plastic wrap and freeze until firm, at least 6 hours or overnight.
• Make the chocolate shell: Stir the chocolate, heavy cream and 4 tablespoons corn syrup in a heatproof bowl set over a saucepan of simmering water (do not let the bowl touch the water) until melted. A spoonful at a time, spread half of the shell mixture over the frozen mousse. Return to the freezer.
• Make the chocolate sauce: Add the remaining 1 tablespoon corn syrup and the butter to the remaining chocolate shell mixture. Microwave 30 seconds, then stir until glossy.
• To serve the cake, beat the heavy cream with a mixer until foamy. Add the sugar and beat until soft peaks form. Remove the cake from the freezer; invert onto a baking sheet and unmold, then invert again onto a platter, chocolate shell-side up.
• Cut the cake in half lengthwise using a warm knife, then cut into thirds crosswise to make 6 rectangles; cut each rectangle in half diagonally to make 2 triangles. Top each triangle with whipped cream, ice cream and the prepared chocolate sauce.

TRIPLE-CHOCOLATE MOUSSE CAKE

Steps:

• Heat oven to 375ºF.
• Pour chocolate syrup into 12-cup fluted tube pan sprayed with cooking spray.
• Beat cake mix, water, oil and 3 eggs in large bowl with mixer 2 min. or until blended. Add sour cream; mix well. Pour over syrup in pan.
• Beat cream cheese and sugar in separate bowl with mixer until blended. Add remaining eggs; mix well. Blend in evaporated milk and melted chocolate; gently spoon over cake batter in pan. Cover with Reynolds Wrap® Aluminum Foil sprayed with cooking spray, sprayed side down.
• Place tube pan in large shallow pan. Add enough water to larger pan to come at least 2 inches up side of tube pan. Bake 1 hour 30 min. or until toothpick inserted near center comes out clean. Cool cake completely in pan. Refrigerate 2 hours. Invert cake onto plate; remove pan. Serve cake topped with COOL WHIP.

CHOCOLATE MOUSSE CAKE IV

Steps:

• Preheat oven to 350 degrees F (175 degrees C). Prepare and bake cake mix according to package directions for two 9-inch layers. Cool and remove from pans.
• In a large bowl, mix together sweetened condensed milk and melted chocolate. Gradually stir in the water, then instant pudding until smooth. Chill for at least 30 minutes.
• Remove the chocolate mixture from the refrigerator, and stir to loosen. Fold in whipped cream and return to the refrigerator for at least another hour.
• Place one layer of cake onto a serving plate. Top with 1 1/2 cups of the mousse, then cover with the remaining cake layer. Frost with the remaining mousse, and refrigerate until serving. Garnish with fresh fruit or chocolate shavings.

INTENSE CHOCOLATE MOUSSE CAKE

Steps:

• Heat oven to 350 degrees. Position the oven rack in lower center of the oven. Cover the outside of a 9-inch springform pan with a double layer of foil. Using a microwave oven or double boiler, melt together chocolate and butter; set aside to cool slightly.
• In a bowl, whisk together egg yolks and 1/2 cup sugar until pale, frothy and increased in volume. Whisk in brandy, then fold in chocolate mixture. Place a kettle of water over heat, and bring it to a boil. Using an electric mixer, whisk egg whites and salt until thick. Add remaining 1/4 cup sugar, and continue to whisk until stiff and shiny but not dry.
• Fold about 1/2 cup whisked egg whites into the chocolate mixture to lighten it. Gently fold in remaining whites, being careful not to let the mixture deflate. Pour mixture into lightly-buttered springform pan, and place pan in a roasting pan. Add boiling water to roasting pan to come halfway up side of springform pan. Bake for 45 minutes; top of cake will be hard and inside will be gooey.
• Remove cake pan from water, and place on a rack to cool completely. Unwrap foil and remove side of springform pan. Place cake on a serving platter. Just before serving, dust top with confectioners' sugar passed through a sieve.

CHOCOLATE MOUSSE CAKE

Steps:

• Grated chocolate, cookie crumbs or chopped nuts for coating the sides of cake, if desired
• Cake:
• Lightly coat the insides of 3 9 by 1 1/2-inch cake pans with melted butter. Line each pan with parchment paper, then lightly coat the parchment paper with more melted butter. Set aside.
• Preheat the oven to 325 degrees Fahrenheit.
• Heat 1-inch of water in the bottom half of a double boiler over medium heat. Place remaining butter and 8 ounces semisweet chocolate in the top half of the double boiler. Tightly cover the top with film wrap. Allow to heat for 10 to 12 minutes. remove from the heat, stir until smooth, and hold at room temperature.
• Place the egg yolks and 3/4 cup sugar in the bowl of an electric mixer fitted with a paddle. Beat on high until slightly thickened and lemon-colored, about 4 minutes. Scrape down the sides of the bowl and beat on high for an additional 2 minutes.
• While the egg yolks are beating, whisk 4 egg whites in a large stainless steel bowl until stiff, but not dry, about 3 to 4 minutes.
• Using a rubber spatula, fold the melted chocolate mixture into the beaten egg yolk mixture. Add a quarter of the beaten egg whites and stir to incorporate, then gently fold in the remaining egg whites.
• Divide the batter between the prepared pans, spreading evenly, and bake in the preheated oven until a toothpick inserted in the center comes out clean, about 25 to 30 minutes. Remove the cakes from the oven and allow to cool in the pans for 15 minutes. (During baking, the surface of the cakes will form a crust; this crust will normally collapse when the cakes are removed from the oven.) Invert the cakes onto cake circles, remove the parchment paper, and refrigerate for 30 minutes.
• Filling:
• To prepare the dark chocolate cream, heat 1-inch of water in the bottom half of a double boiler over medium heat. Place the semisweet chocolate in the top half of the double boiler. Tightly cover the top with film wrap and allow to heat for 8 to 10 minutes. Remove from the heat and stir until smooth. Transfer the melted chocolate to a stainless steel bowl and set aside until needed. Place heavy cream and sugar in the well-chilled bowl of an electric mixer fitted with a well-chilled balloon whip. Whisk on high until stiff peaks form, about 1 1/2 minutes. Remove the bowl from the mixer. Use a hand whisk to combine 1/4 of the whipped cream into the melted chocolate until smooth and completely incorporated. Add the combined whipped cream and chocolate to the remaining whipped cream and use a rubber spatula to fold together.
• Ganache:
• Heat the heavy cream and the butter in a 3-quart saucepan over medium high heat. Bring to a boil. Place the semisweet chocolate in a 3-quart stainless steel bowl. Pour the boiling cream over the chocolate and allow to stand for 5 minutes. Stir until smooth. Chill 1 cup of ganache for at least 1 hour. Remaining ganache should be at room temperature
• To assemble cake:
• Arrange one of the cake layers in a 9-inch springform pan, evenly spread half the filling over the cake and top with the second layer. Add remaining filling and top with the remaining cake layer. Chill 2 hours. Transfer chilled cup of ganache to pastry bag fitted with a star tip. Remove cake from springform pan and coat sides and top with room temperature ganache. Using chilled ganache, decoratively pipe stars on top of cake. If desired, coat sides of cake with grated chocolate, cookie crumbs of chopped nuts.

THE ULTIMATE CHOCOLATE MOUSSE CAKE

Steps:

• For the Cake:.
• Preheat oven to 425°F.
• Wrap the outside of an 8-inch spring form pan with a double layer of tin foil to prevent seepage.
• Butter the inside of the pan and cut a circle out of parchment paper the size of the bottom of the pan. Place it in and butter it too.
• Combine the chocolate and butter in a double boiler over simmering water (don't let it touch the bottom of the pot, it will scorch the chocolate). Stir until the chocolate and butter are smooth and lump free. You can also microwave the mixture on 100% or high. Make sure you stop and stir the mixture every 15 seconds; remove the chocolate when all the lumps are gone.
• Put the eggs in a large mixer bowl over simmering water and stir constantly until warm to the touch, about 3 minutes; remove from the heat. If using an electric mixer, beat the eggs until triple in volume and form soft peaks when the beater is lifted, 5-8 minutes. To ensure maximum volume when using a hand mixer continue to beat the eggs over simmering water until hot to the touch, about 5 minutes, then removed from heat until cool.
• Fold half the eggs into the melted chocolate until partially incorporated. Add the remaining eggs and fold until just blended but no streaks remain.
• Pour at once into your prepared spring form pan and smooth the surface with an off-set spatula. Place the spring form pan into a larger pan and carefully pour boiling water into the larger pan until the water is about 2/3 of the way up the side of the spring form pan. Don't get any water on the chocolate! This method of a water bath is often referred to as a "bain marie".
• Bake the cake for 5 minutes. Then cover the spring form pan loosely with lightly buttered tin foil and bake for 10 more minutes. Remove the cake from the oven and let cool on a wire rack for 45 minutes; then cover it again and refrigerate it for at least 3 hours.
• To remove the cake from the spring form pan: Run a small spatula around the edge of the spring form until the sides of the cake come loose. Place the cake on a round plate that the cake fits nicely on and invert the plate and open the spring form pan up and remove from the cake. Remove the bottom metal part of the spring form pan and the parchment. Cover it again with tin foil and leave for another 6 hours or over night. It needs to be really chilled to set.
• If you are making the Ganache, set the cake on a metal rack and put wax paper under the cake (tuck strips). Pour the tepid glaze over the center of the cake and allow the ganache to dribble down the sides of the cake.
• Using a metal off set spatula run it around the top of the cake to ensure that the g.
• Ganache won't be too thick on the top. Patch any bare spots at this point. If any air holes occur, use a pin to break them. Remove the strips of wax paper from under the cake and let this stand undisturbed for 2-3 hours at room temperature, or 30 minutes in the fridge.
• Bon Appetit!

EASY CHOCOLATE MOUSSE CAKE

Steps:

• Preheat oven to 350°F.
• Use a 9 inch springform pan.
• With pan locked, coat inside of pan with a thin film of butter. This will help alumnium foil to adhere to contour of pan. Place sheet of alumnium foil inside pan and press along bottom and sides.
• This step will prevent batter from leaking during baking.
• In heavy saucepan, over low heat, combine butter, sugar, and coffee; stir until all is melted.
• Remove from heat.
• In separate bowl, beat eggs (by hand or electric mixer) a couple of minutes, until slightly thickened.
• Stir in chocolate and mix to a uniform color.
• Pour in pan and bake for 50 to 60 minutes.
• Cake will fall slightly as it cools.
• When room temperature, open springform pan, peel foil away from sides, place serving plate on top and flip over. Remove remaining foil.
• Serve at room temperature.
• Note: This cake is rather hard to slice, use plain dental floss or kitchen string, and holding taut in both hands, slice through cake, dividing it as you go.
• For Christmas, decorate center with holly leaves and cranberries.

CHOCOLATE MOUSSE CAKE

Steps:

• Preheat the oven to 400 degrees F. Add instant coffee to melted butter. Set aside.
• Beat the egg whites until stiff, set aside. Beat the egg yolks until lemon colored in an upright mixer. Add the sugar to the egg yolks and beat until combined. Add the brandy, vanilla, melted butter, and chocolate. Add the flour, just to combine. Fold in the egg whites and walnuts.
• Pour into a greased and floured 9-inch springform pan and bake about 20 minutes. Center will be soft. Serve with whipped cream.

CHOCOLATE MOUSSE CAKE

Steps:

• Start by making the base.
• Gently melt the chocolate and stir in the ginger.
• Then mix in the ground almonds.
• Let cool for a minute until the mixture is not too hot to handle.
• Place the cake ring on your chosen serving dish and gently press in the chocolate mixture to create a base.
• Put the plate in the fridge while you make the mousse.
• To make the mousse, chop the chocolate into small pieces and place in a bowl.
• In a small saucepan, bring 150ml of double cream to the boil, then pour over the chopped chocolate, stirring to distribute the heat of the cream until the chocolate has melted.
• Lightly whip the remaining double cream.
• Do not overwhisk or the mousse will become grainy.
• Once the chocolate cream mix has cooled to room temperature, fold in the lightly whipped cream.
• Pour the mousse mix into the cake ring on top of the base.
• Cover with cling film and place in the fridge for at least an hour before proceeding.
• Meanwhile, you can make the glaze.
• Chop up the chocolate and set aside.
• In a small pan, bring the water, coffee and cocoa powder to a boil, whisking to dissolve the cocoa.
• Place the sugar in a small pan over medium heat.
• As it heats up, the sugar will begin to melt and caramelise very quickly.
• You may need to brush the pan with a bit of cold water to keep it from burning, so it is good to have some to hand.
• When the melted sugar has become a golden caramel, pour in the water, coffee and cocoa mix.
• Beat in the chopped chocolate and, when completely melted, pass the mixture through a fine sieve.
• When cool but still liquid, pour the glaze on top of the mousse and return the cake to the fridge to set.
• You can now leave the cake overnight.
• The next day, dust it with cocoa powder and then decorate it.
• Very classic and beautiful is to cut the strawberries in half lengthwise and lay them cut-side down along the edge of the cake.
• Sprinkle the hazelnuts all over the top.
• Keep cool until you are ready to serve the cake.
• It cuts best if you use a knife dipped in hot water.

CHOCOLATE MOUSSE CAKE WITH CINNAMON CREAM

Steps:

• Make cake:
• Preheat oven to 325°F. Butter an 8-inch round cake pan (about 2 inches deep) and line bottom with a round of parchment paper or foil.
• In medium saucepan bring water and sugar to a simmer over moderate heat, stirring occasionally. Add butter and simmer, stirring occasionally, until melted. Remove pan from heat and add chocolate, swirling pan to submerge chocolate in hot syrup. Let chocolate stand in syrup 3 minutes and whisk until smooth.
• In a large bowl whisk together eggs, coffee, rum, and cinnamon. Add chocolate mixture, whisking until well combined, and pour into cake pan.
• Put cake in pan in larger pan and add enough water to reach halfway up side of cake pan. Bake cake in middle of oven 45 minutes, or until slightly firm to the touch. Cool cake completely in pan on rack.
• Cake may be kept in pan, wrapped in plastic wrap, and chilled 1 week or frozen 1 month. Thaw cake completely before proceeding.
• Run a thin knife around pan to loosen cake and put pan on hot stove burner for 3 to 4 seconds. Invert cake onto a plate and remove parchment or foil. Bring cake to room temperature.
• Make cream:
• In a bowl with an electric mixer or whisk beat cream with sugar and cinnamon until it just holds stiff peaks.
• Just before serving, spread cream over top of cake or spoon onto plates alongside individual pieces.

CHOCOLATE MOUSSE CAKE

Steps:

• Preheat oven to 350 degrees.
• Grease and flour 3 9-inch round cake pans.
• Prepare cake-In large bowl combine sugar, flour, cocoa, baking powder and soda, and salt.
• Add eggs, milk, oil and vanilla-Beat 2 minutes.
• Stir in boiling Water.
• Divide batter in pans.
• Bake for 20 minutes, and cool completely.
• To prepare mousse-Combine all ingredients and whip on high till soft peaks form. Chill under ready to spread over cake layers.
• To prepare chocolate ganache-combine chips and half and half in double boiler and cook until combined. Remove from heat and let cool
• Once cake layers are cooled, spread mousse between layers.
• Spread Chocolate ganache over entire cake-best to do when ganach is a BIT warm or room temperature.
• Allow cake to cool and set.

CHOCOLATE MOUSSE CAKE

Steps:

• Cake:.
• Lightly grease insides of 3 9 inch cake pans with melted butter. Line each pan with parchment paper, then lightly grease parchment paptr with more melted butter. Set aside.
• Preheat oven to 325 degrees F.
• Heat 1 inch water in bottom of a double boiler over medium heat. Place 14 tablespoons butter and 8 ounces of bittersweet chocolate in top of double boiler. Tightly cover top with plastic wrap. Allow to heat for 10-12 minutes, remove from heat, stir until smooth and hold at room temperature.
• Place 8 egg yolks and 3/4 cup sugar in bowl of electric mixed with paddle. Beat on high until slightly thickened and lemon-colored, about 4 minutes. Scrape down the sides of the bowl and beat on high for an additional 2 minutes.
• In another bowl, whisk or beat 4 egg whites until stiff, but not dry, about 3-4 minutes.
• Fold the melted chocolate mixture into the beaten egg yolk mixture. Add a quarter of the beaten egg whites and stir to incorporate, then gently fold in remaining egg whites.
• Divide the batter among the 3 pans, spread evenly and bake until a toothpick inserted in the center comes out clean, about 22-30 minutes. Allow to cool in pans for 15 minutes. (During baking, the surface of the cakes will form a crust; this crust will normally collapse, when the cakes are removed from the oven.) Invert the cakes onto cake circles, remove the parchment and refrigerate for 30 minutes.
• Mousse Filling:.
• Heat 1 inch of water in bottom of a double boiler over medium heat. Place 8 ounces of bittersweet chocolate in top of double boiler. Tightly cover with plastic wrap and allow to heat for 8-10 minutes. Remove from heat, stir until smooth. transfer melted chocolate to a stainless steel bowl and set aside until needed. Place 2 1/2 cups of heavy cream and 2 tablespoons of sugar in a well chilled bowl of electric mixer fitted with well-chilled balloon whip. Whisk on high until stiff peaks form, about 1 1/2 minutes. Remove the bowl from the mixer. Use a hand whisk to combine 1/4 of the whipped cream into the melted chocolate until smooth and completely incorporated. Add the combined whipped cream and chocolate to the remaining whipped cream and fold together.
• Ganache:.
• Heat 1 1/2 cups of heavy cream and 2 tablespoons unsalted butter in a 3 quart saucepan over medium high heat. Bring to a boil. Place the 18 ounces of bittersweet chocolate in 3 quart stainless steel bowl. Pour the boiling cream over the chocolate and allow to stand for 5 minutes. Stir until smooth. Chill 1 cup of ganache for at least 1 hour. Remaining ganahe should be at room temperature.
• Assemble the cake:.
• Arrange one of the cake layers in a 9 inch springform pan, evenly spread half of the mousse filling over the cake and top with the second layer. Add remaining mousse and top with the remaining cake layer. Chill 2 hours. Transfer chilled cup of ganache to a pastry bag fitted a star tip. Remove cake from springform pan and coat top and sides with room temperature ganache. Using chilled ganache, pipe decorative stars on top of cake.

PASSOVER CHOCOLATE MOUSSE CAKE

Steps:

• Preheat the oven to 350°F (180°C). Line the bottom of a 9-inch (23-cm) springform pan with parchment paper.
• Break up or chop the chocolate and place it in a heatproof bowl with the butter or margarine. Set the bowl over a saucepan of barely simmering water and allow the chocolate and butter to melt, stirring occasionally. When everything has melted, remove from the heat and let cool to room temperature.
• In the meantime, put the egg yolks in a large bowl. In the bowl of a stand mixer fitted with the whisk attachment, or in a large bowl, using a handheld mixer, whip the egg whites to very firm peaks, about 5 minutes.
• When the melted chocolate mixture has cooled, add it to the egg yolks, along with the sugar, and whisk well.
• Using a rubber spatula, stir about one-third or less of the egg whites into the chocolate mixture to lighten it. Carefully spoon another third of the egg whites on top of the chocolate mixture and gently fold them in. Add the remaining whites and fold them in just until incorporated.
• Transfer half of the batter to another bowl and set aside in the refrigerator.
• Pour the remaining batter into the prepared pan and bake for 20 minutes: it will turn into a soft, moist cake. Remove from the oven and let cool completely in the pan.
• When the cake has reached room temperature, pour the reserved chocolate mousse on top of it. Refrigerate the mousse cake, uncovered, for at least 2 hours, or overnight, until set.
• When you're ready to serve, run a sharp thin-bladed knife around the cake's edges and then remove the sides of the springform pan. Peel the paper from the bottom, and place the cake on a serving platter. Serve cold, decorated with chocolate shavings, if desired.
• Leftover cake will keep in the refrigerator, wrapped in aluminum foil, for a couple of days.

BAKED CHOCOLATE MOUSSE CAKE

Steps:

• Preheat the oven to 325 degrees F (165 degrees C).
• Mix boiling water and cocoa powder for cake together in a small mixing bowl until smooth. Let cool, about 10 minutes.
• Meanwhile, sift flour, sugar, baking soda, and salt together in a large bowl. Make a well in the center, pour in oil, egg yolks, vanilla extract, and cooled cocoa mixture. Mix using a wooden spoon just until smooth.
• Sprinkle cream of tartar over egg whites in a large mixing bowl. Beat using an electric mixer on high speed until very stiff peaks form. Pour cake batter over egg white mixture and fold gently using a whisk with an under-and-over motion; be sure not to overmix, but to also fully incorporate ingredients. Pour batter into an ungreased 10-inch tube pan.
• Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 1 hour. Let cake cool in the pan for 1 1/2 hours. Loosen with a spatula and transfer to a plate.
• Add cold water to a glass bowl and sprinkle gelatin on top; allow to soften. Place bowl over a saucepan filled with simmering water. Heat and stir until gelatin is fully dissolved, 2 to 3 minutes. Remove from heat and let cool.
• Combine heavy cream, confectioners' sugar, cocoa, vanilla extract, and salt in a large bowl. Refrigerate for 1 hour. Beat mixture using an electric mixer until stiff; keep mousse in refrigerator until needed.
• Cut a 1-inch slice crosswise from the top of the cooled cake and set aside. Outline a cavity in the cake using a sharp knife, leaving 1-inch walls around cake side and bottom. Carefully remove cake from the cavity using a spoon; reserve.
• Measure 2 1/2 cups of mousse filling and fold in gelatin. Fill the cake cavity and replace top of cake. Mix 1/2 cup filling with cake crumbs and fill center hole of cake. Frost the top and sides with remaining filling. Refrigerate until set, 2 to 3 hours.