Ingredients
cake
- 2 ounces bittersweet chocolate (do not exceed 61% cacao), chopped
- 2/3 cup unsweetened cocoa powder
- 1 3/4 cups boiling water
- 2 3/4 cups all purpose flour
- 1 1/4 teaspoons baking soda
- 1/4 teaspoon baking powder
- 1 cup sugar
- 1 cup (packed) dark brown sugar
- 1 1/3 cups mayonnaise (do not use reduced-fat or fat-free)
- 2 large eggs
- 1 teaspoon vanilla extract
frosting
- 10 ounces bittersweet chocolate (do not exceed 61% cacao), chopped
- 1 1/2 cups (3 sticks) unsalted butter, room temperature
- 3 cups powdered sugar
- 1 tablespoon vanilla extract
special equipment
- Three 8-inch-diameter cake pans with 1 1/2-inch-high sides
Preparation
cake
- Preheat oven to 350°F. Butter and flour three 8-inch-diameter cake pans with 1 1/2-inch-high sides. Combine chopped chocolate and cocoa powder in medium metal bowl. Add 13/4 cups boiling water and whisk until chocolate is melted and mixture is smooth.
- Sift flour, baking soda, and baking powder into another medium bowl. Using electric mixer, beat both sugars and mayonnaise in large bowl until well blended, 2 to 3 minutes. Add eggs 1 at a time, beating until well blended after each addition. Beat in vanilla. Add flour mixture in 4 additions alternately with chocolate mixture in 3 additions, beating until blended after each addition and occasionally scraping down sides of bowl. Divide batter among prepared cake pans (about 2 1/3 cups for each).
- Bake cakes until tester inserted into center comes out clean, 30 to 32 minutes. Cool cakes in pans on racks 20 minutes.
- Run small knife around sides of cakes to loosen. Carefully invert cakes onto racks and let cool completely.
FROSTING
- Place chopped chocolate in medium metal bowl; set bowl over saucepan of simmering water and stir until chocolate is melted and smooth. Carefully remove bowl from over water; let melted chocolate cool until lukewarm, stirring occasionally.
- Using electric mixer, beat butter in large bowl until smooth and creamy. Sift powdered sugar over butter and beat until well blended, about 2 minutes. Beat in vanilla. Add melted chocolate and beat until well blended and smooth, occasionally scraping down sides of bowl.
- Place 1 cake layer on platter. Spread 3/4 cup frosting over top of cake layer to edges. Top with second cake layer; spread 3/4 cup frosting over. Top with third cake layer. Spread remaining frosting decoratively over top and sides of cake. DO AHEAD Can be made 1 day ahead. Cover with cake dome and let stand at room temperature.
- Cut cake into wedges and serve.
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