Here’s the recipe for my birthday present to myself this year: a heavenly-rich dark chocolate layer cake with an espresso buttercream frosting… Happy Birthday to me!
For cake layers:
- 3 ounces fine-quality semisweet chocolate such as Callebaut
- 1 1/2 cups hot brewed coffee
- 3 cups sugar
- 2 1/2 cups all-purpose flour
- 1 1/2 cups unsweetened cocoa powder (not Dutch process)
- 2 teaspoons baking soda
- 3/4 teaspoon baking powder
- 1 1/4 teaspoons salt
- 3 large eggs
- 3/4 cup vegetable oil
- 1 1/2 cups well-shaken buttermilk
- 3/4 teaspoon vanilla
For the Espresso Swiss Meringue Buttercream:
- 5 large egg whites
- 1 cup plus 2 tablespoons sugar
- Pinch of salt
- 1 pound (4 sticks) unsalted butter, cut into tablespoons, room temperature
- 1 1/2 teaspoons pure vanilla extract mixes with 2 tablespoons good quality instant espresso powder (do not use instant coffee)
Make cake layers: Preheat oven to 300°F / 150°C and grease pans. Line bottoms with rounds of wax paper and grease paper.
Finely chop chocolate and in a bowl combine with hot coffee. Let mixture stand, stirring occasionally, until chocolate is melted and mixture is smooth.
Into a large bowl sift together sugar, flour, cocoa powder, baking soda, baking powder, and salt. In another large bowl with an electric mixer beat eggs until thickened slightly and lemon colored (about 3 minutes with a standing mixer or 5 minutes with a hand-held mixer). Slowly add oil, buttermilk, vanilla, and melted chocolate mixture to eggs, beating until combined well. Add sugar mixture and beat on medium speed until just combined well.
Divide batter between pans and bake in middle of oven until a tester inserted in center comes out clean, 1 hour to 1 hour and 10 minutes.
Cool layers completely in pans. Run a thin knife around edges of pans and invert layers onto racks. Carefully remove wax paper and cool layers completely. Cake layers may be made 1 day ahead and kept, wrapped well in plastic wrap, at room temperature.
Place sugar and egg whites in a heat-proof bowl of an electric mixer. Set bowl over a pan of gently simmering water, and whisk until sugar has dissolved and egg whites are hot to the touch, about 3 minutes. Test by rubbing the mixture between your fingers; it should feel completely smooth.
Remove bowl from heat and using an electric whisk or mixer beat on high speed until mixture has cooled completely and formed stiff and glossy peaks, about 10 minutes.
Add the butter, one piece at a time, and beat until incorporated after each addition. Don’t worry if the buttercream appears curdled after all the butter has been added; it will become smooth again with continued beating. Add the vanilla and espresso mixture, and beat just until combined.
Beat on the lowest speed to eliminate any air pockets, about 5 minutes. If using buttercream within several hours, cover bowl with plastic wrap, and set aside at room temperature in a cool environment. Or transfer to an airtight container, and store in the refrigerator, up to 3 days. Before using, bring buttercream to room temperature, and beat on the lowest speed with the paddle attachment until smooth, about 5 minutes.
Spread frosting over the first cake layer then arrange the second layer on top. Carefully frost the entire cake, then sprinkle with chocolate shavings.