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I have made this cake for the past several years with unfailing applause. I got the recipe from Cooks Illustrated. Do not substitute semisweet chocolate chips for the chopped semisweet chocolate in the frosting—chocolate chips contain less cocoa butter than bar chocolate and will not melt as readily. For best results, don't make the frosting until the cakes are cooled, and use the frosting as soon as it is ready. If the frosting gets too cold and stiff to spread easily, wrap the mixer bowl with a towel soaked in hot water and mix on low speed until the frosting appears creamy and smooth. Refrigerated leftover cake should sit at room temperature before serving until the frosting softens. Recipe for the wonderful Frosting is on this site "The Very Best Chocolate Fudge Icing"
- 12 tablespoons butter (1 1/2 sticks, very soft)
- 1 3⁄4 cups all-purpose flour (8 3/4 ounces, sifted, unbleached)
- 4 ounces unsweetened chocolate (coarsely chopped)
- 1⁄4 cup Dutch-processed cocoa powder (3/4 ounce)
- 1⁄2 cup water (hot)
- 1 3⁄4 cups sugar (12 1/4 ounces)
- 1 1⁄2 teaspoons baking soda
- 1 teaspoon salt
- 1 cup buttermilk
- 2 teaspoons vanilla extract
- 4 large eggs
- 2 large egg yolks
- 1. FOR THE CAKE: Adjust oven rack to middle position; heat oven to 350 degrees. Grease two 9-inch-round by 2-inch-high cake pans with softened butter; dust pans with flour and knock out excess. Combine chocolate, cocoa powder, and hot water in medium heatproof bowl; set bowl over saucepan containing 1 inch of simmering water and stir with rubber spatula until chocolate is melted, about 2 minutes. Add 1/2 cup sugar to chocolate mixture and stir until thick and glossy, 1 to 2 minutes. Remove bowl from heat and set aside to cool.
- 2. Whisk flour, baking soda, and salt in medium bowl. Combine buttermilk and vanilla in small bowl. In bowl of standing mixer fitted with whisk attachment, whisk eggs and yolks on medium-low speed until combined, about 10 seconds. Add remaining 1 1/4 cups sugar, increase speed to high, and whisk until fluffy and lightened in color, 2 to 3 minutes. Replace whisk with paddle attachment. Add cooled chocolate mixture to egg/sugar mixture and mix on medium speed until thoroughly incorporated, 30 to 45 seconds, pausing to scrape down sides of bowl with rubber spatula as needed. Add softened butter one tablespoon at a time, mixing about 10 seconds after each addition. Add about one-third of flour mixture followed by half of buttermilk mixture, mixing until incorporated after each addition (about 15 seconds). Repeat using half of remaining flour mixture and all of remaining buttermilk mixture (batter may appear separated). Scrape down sides of bowl and add remaining flour mixture; mix at medium-low speed until batter is thoroughly combined, about 15 seconds. Remove bowl from mixer and fold batter once or twice with rubber spatula to incorporate any remaining flour. Divide batter evenly between prepared cake pans; smooth batter to edges of pan with spatula.
- 3. Bake cakes until toothpick inserted into center comes out with a few crumbs attached, 25 to 30 minutes. Cool cakes in pans 15 minutes, then invert onto wire rack. Cool cakes to room temperature before frosting, 45 to 60 minutes.