Cuban Opera Cake Recipes

Steps:

• For cake: Preheat oven to 325°F Butter two 9-inch-diameter cake pans with 2-inch-high sides; line bottoms with parchment paper rounds. Dust pans with flour; tap out excess. Melt chocolate in top of double boiler over simmering water, stirring until melted and smooth. Remove from over water. Cool to lukewarm. Whisk flour, baking soda, and salt in medium bowl. Using electric mixer, beat sugar, butter, and vanilla in large bowl to blend. Add eggs 1 at a time, beating well after each addition and stopping occasionally to scrape down sides of bowl. Gradually beat in lukewarm melted chocolate. Beat in dry ingredients in 3 additions alternately with sour cream in 2 additions, beginning and ending with dry ingredients. Gradually beat in crème de cacao and coffee. Divide batter evenly between prepared pans; smooth tops.
• Bake cakes until toothpick inserted into centers comes out clean, about 35 minutes. Cool cakes in pans on racks 10 minutes. Invert cakes onto 9-inch cardboard rounds or removable tart pan bottoms; cool cakes completely on racks.
• For buttercream: Melt milk chocolate in top of double boiler over simmering water, stirring until smooth. Remove from over water. Whisk sugar, egg yolks, 2 tablespoons water, and corn syrup in medium metal bowl to blend. Add 1/4 cup butter. Set bowl over saucepan of simmering water; whisk constantly until mixture reaches 170°F, about 4 minutes. Remove bowl from over water. Using electric mixer, beat until completely cool and thick, about 6 minutes. Gradually beat in 1/2 cup butter, about 1 tablespoon at a time, fully incorporating each addition and stopping occasionally to scrape down sides of bowl. Beat in lukewarm melted chocolate.
• For coffee mousse:Bring half and half, 2 tablespoons sugar, and espresso powder to simmer in small saucepan over medium-high heat. Whisk egg yolks and remaining 2 tablespoons sugar in medium bowl to blend. Gradually whisk hot half and half mixture into yolk mixture. Return mixture to saucepan and stir constantly over medium heat until thermometer registers 160°F, about 2 minutes. Pour into large bowl. Add softened gelatin; stir until dissolved. Using electric mixer, beat until cool, about 10 minutes. Using clean dry beaters, beat cream and vanilla in medium bowl until stiff peaks form. Fold whipped cream into coffee mixture.
• Cut each cake layer horizontally in half. Place 1 cake layer in bottom of 9-inch-diameter springform pan. Cover with 3/4 cup buttercream. Place second cake layer atop buttercream; cover with mousse. Top with third cake layer. Refrigerate 1 hour to allow mousse to set. Spread 3/4 cup buttercream over third cake layer. Top with fourth cake layer (cake will rise above rim of pan). Cover and refrigerate at least 4 hours or overnight.
• For chocolate glaze: Stir sugar and 1 cup water in medium saucepan over medium heat until sugar dissolves. Increase heat to high; bring to boil. Whisk in cocoa; remove from heat. Add chocolate; whisk until smooth. Let stand until cool but still pourable, about 2 hours.
• Run knife around pan sides to loosen cake. Release pan sides. Scrape excess mousse from sides of cake. Transfer cake on springform pan bottom to rack set over baking sheet. Pour glaze over cake, allowing glaze to drip down edges onto baking sheet (use spatula to spread glaze over any uncovered spots). Refrigerate at least 2 hours to allow glaze to set. (Can be made 1 day ahead. Keep refrigerated. Let stand at room temperature 1 hour before serving.).

Steps:

• Make sponge cake:
• Put oven rack in middle position and preheat oven to 425°F. Butter baking pan, then line bottom with a sheet of parchment or wax paper, leaving a 1-inch overhang on short sides, and generously butter paper. Dust pan with cake flour, knocking out excess.
• Beat whole eggs in a large bowl with a handheld electric mixer at high speed until eggs have tripled in volume and form a ribbon when beaters are lifted, 2 to 3 minutes. Reduce speed to low, then add almond flour and confectioners sugar and mix until just combined. Resift cake flour over batter and gently fold in.
• Beat egg whites in a bowl with cleaned beaters at medium speed until foamy. Add cream of tartar and salt and beat until whites just hold soft peaks. Add granulated sugar, then increase speed to high and beat until whites just hold stiff peaks.
• Fold one third of whites into almond mixture to lighten, then fold in remaining whites gently but thoroughly. Fold in butter, then pour batter evenly into baking pan, spreading gently and evenly with offset spatula and being careful not to deflate (batter will be about 1/4 inch thick).
• Bake until very pale golden, 8 to 10 minutes, then cool in pan on a rack 10 minutes.
• Loosen edges of cake with spatula, then transfer cake (on paper) to a cutting board. Cut cake into strips and squares. Trim outside edges slightly, then carefully peel paper from strips and squares and set back on paper.
• Make coffee syrup:
• Stir together espresso powder and 1 tablespoon water until powder is dissolved. Bring sugar and remaining 1/2 cup water to a boil in a 1- to 2-quart heavy saucepan, stirring until sugar is dissolved. Reduce heat and simmer syrup, without stirring, 5 minutes. Remove from heat and stir in Cognac and coffee mixture.
• Make coffee buttercream:
• Stir together espresso powder and 1 tablespoon water until powder is dissolved. Bring sugar and remaining 1/4 cup water to a boil in a very small heavy saucepan, stirring until sugar is dissolved. Boil, without stirring, washing down any sugar crystals on side of pan with a pastry brush dipped in cold water, until syrup registers 238°F on thermometer (soft-ball stage; see cooks' note, below).
• While syrup boils, beat yolks in a large bowl with cleaned beaters at medium speed 1 minute.
• Add hot syrup to yolks in a slow stream (try to avoid beaters and side of bowl), beating, then add coffee mixture and beat until completely cool, 3 to 5 minutes. Beat in butter, 1 piece at a time, and beat until thickened and smooth.
• Make glaze:
• Melt butter and all but 2 tablespoons chopped chocolate in a double boiler or in a metal bowl set over a saucepan of barely simmering water, stirring occasionally, until smooth. Remove top of double boiler and stir in remaining 2 tablespoons chocolate until smooth, then cool glaze until room temperature but still liquid.
• Assemble cake:
• Put 1 cake square on a plate, then brush generously with one third of coffee syrup. Spread half of buttercream evenly over top with cleaned offset spatula, spreading to edges.
• Arrange both cake strips side by side on top of first layer (any seam will be hidden by next layer), then brush with half of remaining coffee syrup. Spread half of glaze evenly over top, spreading just to edges.
• Top with remaining cake square and brush with remaining coffee syrup. Spread remaining buttercream evenly over top, spreading just to edges. Chill cake until buttercream is firm, about 30 minutes.
• Reheat remaining glaze over barely simmering water just until shiny and spreadable (but not warm to the touch), about 1 minute. Pour all but 1 tablespoon glaze over top layer of cake and spread evenly just to edges. Scrape remaining tablespoon glaze into sealable plastic bag and twist bag so glaze is in 1 corner. Snip a tiny hole in corner and decorate cake (leave a 1/2-inch border around edges). Chill cake until glaze is set, about 30 minutes, then trim edges slightly with a sharp serrated knife.

Steps:

• For cake:
• Preheat oven to 325°F. Butter two 9-inch-diameter cake pans with 2-inch-high sides; line bottoms with parchment paper rounds. Dust pans with flour; tap out excess. Melt chocolate in top of double boiler over simmering water, stirring until melted and smooth. Remove from over water. Cool to lukewarm. Whisk flour, baking soda, and salt in medium bowl. Using electric mixer, beat sugar, butter, and vanilla in large bowl to blend. Add eggs 1 at a time, beating well after each addition and stopping occasionally to scrape down sides of bowl. Gradually beat in lukewarm melted chocolate. Beat in dry ingredients in 3 additions alternately with sour cream in 2 additions, beginning and ending with dry ingredients. Gradually beat in crème de cacao and coffee. Divide batter evenly between prepared pans; smooth tops.
• Bake cakes until toothpick inserted into centers comes out clean, about 35 minutes. Cool cakes in pans on racks 10 minutes. Invert cakes onto 9-inch cardboard rounds or removable tart pan bottoms; cool cakes completely on racks.
• For buttercream:
• Melt milk chocolate in top of double boiler over simmering water, stirring until smooth. Remove from over water. Whisk sugar, egg yolks, 2 tablespoons water, and corn syrup in medium metal bowl to blend. Add 1/4 cup butter. Set bowl over saucepan of simmering water; whisk constantly until mixture reaches 170°F, about 4 minutes. Remove bowl from over water. Using electric mixer, beat until completely cool and thick, about 6 minutes. Gradually beat in 1/2 cup butter, about 1 tablespoon at a time, fully incorporating each addition and stopping occasionally to scrape down sides of bowl. Beat in lukewarm melted chocolate.
• For coffee mousse:
• Bring half and half, 2 tablespoons sugar, and espresso powder to simmer in small saucepan over medium-high heat. Whisk egg yolks and remaining 2 tablespoons sugar in medium bowl to blend. Gradually whisk hot half and half mixture into yolk mixture. Return mixture to saucepan and stir constantly over medium heat until thermometer registers 160°F, about 2 minutes. Pour into large bowl. Add softened gelatin; stir until dissolved. Using electric mixer, beat until cool, about 10 minutes. Using clean dry beaters, beat cream and vanilla in medium bowl until stiff peaks form. Fold whipped cream into coffee mixture.
• Cut each cake layer horizontally in half. Place 1 cake layer in bottom of 9-inch-diameter springform pan. Cover with 3/4 cup buttercream. Place second cake layer atop buttercream; cover with mousse. Top with third cake layer. Refrigerate 1 hour to allow mousse to set. Spread 3/4 cup buttercream over third cake layer. Top with fourth cake layer (cake will rise above rim of pan). Cover and refrigerate at least 4 hours or overnight.
• For chocolate glaze:
• Stir sugar and 1 cup water in medium saucepan over medium heat until sugar dissolves. Increase heat to high; bring to boil. Whisk in cocoa; remove from heat. Add chocolate; whisk until smooth. Let stand until cool but still pourable, about 2 hours.
• Run knife around pan sides to loosen cake. Release pan sides. Scrape excess mousse from sides of cake. Transfer cake on springform pan bottom to rack set over baking sheet. Pour glaze over cake, allowing glaze to drip down edges onto baking sheet (use spatula to spread glaze over any uncovered spots). Refrigerate at least 2 hours to allow glaze to set. (Can be made 1 day ahead. Keep refrigerated. Let stand at room temperature 1 hour before serving.)