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Bittersweet Chocolate Roulade




Source of Recipe


America's Test Kitchen






Recipe Introduction


We suggest that you make the filling and ganache first, then make the cake while the ganache is setting up. Or, if you prefer, the cake can be baked, filled, and rolled—but not iced—then wrapped in plastic and refrigerated for up to 24 hours. The roulade is best served at room temperature.





List of Ingredients



• 6 ounces bittersweet or semisweet chocolate, chopped fine
  
• 2 tablespoons cold unsalted butter, cut into two pieces
  
• 2 tablespoons cold water
  
• 1/4 cup Dutch-processed cocoa, sifted, plus 1 tablespoon for unmolding
  
• 1/4 cup (1.25 ounces) unbleached all-purpose flour, plus more for baking sheet
  
• 1/8 teaspoon salt
  
• 6 large eggs, separated
  
• 1/3 cup (2.3 ounces) sugar
  
• 1 teaspoon vanilla extract
  
• 1/8 teaspoon cream of tartar
  
• 1 recipe Espresso-Mascarpone Cream
  
• 1 recipe Dark Chocolate Ganache
  






Instructions



1. Adjust oven rack to upper-middle position and heat oven to 400 degrees. Spray 12 by 17 1/2-inch rimmed baking sheet with nonstick cooking spray, cover pan bottom with parchment paper, and spray parchment with nonstick cooking spray; dust surface with flour and tap out excess.
   
2. Bring 2 inches water to simmer in small saucepan over medium heat. Combine chocolate, butter, and water in small heatproof bowl and cover tightly with plastic wrap. Set bowl over pan, reduce heat to medium-low, and heat until butter is almost completely melted and chocolate pieces are glossy, have lost definition, and are fully melted around edges, about 15 minutes. (Do not stir or let water boil under chocolate.) Remove bowl from pan, unwrap, and stir until smooth and glossy. While chocolate is melting, sift 1/4 cup cocoa, flour, and salt together into small bowl and set aside.
   
3. In bowl of standing mixer fitted with whisk attachment, beat yolks at medium-high speed until just combined, about 15 seconds. With mixer running, add half of sugar. Continue to beat, scraping down sides of bowl as necessary until yolks are pale yellow and mixture falls in thick ribbon when whisk is lifted, about 8 minutes. Add vanilla and beat to combine, scraping down bowl once, about 30 seconds. Turn mixture into medium bowl; wash mixer bowl and whisk attachment and dry with paper towels. (If you have 2 mixer bowls, leave yolk mixture in mixer bowl; wash and dry whisk attachment, and use second bowl in step 4.)
   
4. In clean bowl with clean whisk attachment, beat whites and cream of tartar at medium speed until foamy, about 30 seconds. With mixer running, add about 1 teaspoon sugar; continue beating until soft peaks form, about 40 seconds. Gradually add remaining sugar and beat until whites are glossy and supple and hold stiff peaks when whisk is lifted, about 1 minute longer. Do not overbeat (if whites look dry and granular, they are overbeaten). While whites are beating, stir chocolate mixture into yolks. With rubber spatula, stir one quarter of whites into chocolate mixture to lighten it. Fold in remaining whites until almost no streaks remain. Sprinkle dry ingredients over top and fold in quickly but gently.
   
5. Pour batter into prepared pan; using an offset icing spatula and working quickly, even surface and smooth batter into pan corners. Bake until center of cake springs back when touched with finger, 8 to 10 minutes, rotating pan halfway through baking. Cool in pan on wire rack for 5 minutes.
   
6. While cake is cooling, lay clean kitchen towel over work surface and sift remaining tablespoon cocoa over towel; with hands, rub cocoa into towel. Run paring knife around perimeter of baking sheet to loosen cake. Invert cake onto towel and peel off parchment.
   
7. Roll cake, towel and all, into jelly roll shape. Cool for 15 minutes, then unroll cake and towel. Using offset spatula, immediately spread filling evenly over surface of cake, almost to edges. Roll up cake gently but snugly around filling. Set large sheet of parchment paper on overturned rimmed baking sheet and set cake seam-side down on top. Trim both ends on diagonal. Spread ganache over roulade with small icing spatula. Use fork to make wood-grain striations on surface of ganache before icing has set. Refrigerate baking sheet with cake, uncovered, to slightly set icing, about 20 minutes.
   
8. Carefully slide 2 wide metal spatulas under cake and transfer cake to serving platter. Cut into slices and serve.
   
   






Final Comments


Serves 8 to 10