From America's Test Kitchen Season 3: Two Chocolate Cakes
While all flourless chocolate cake recipes share common ingredients (chocolate, butter, and eggs), the techniques used to make them vary, as do the results. You can end up with anything from a fudge brownie to a bittersweet chocolate soufflé. We wanted something dense, moist, and ultra-chocolaty, but with some textural finesse.
We started with the type of chocolate. A cake made with unsweetened chocolate was neither smooth nor silky enough for this kind of cake. Bittersweet or semisweet chocolate each won out—both delivered deep chocolate flavor and a smooth texture. Next we turned to the eggs—we compared cakes made with room temperature whole eggs and whole eggs taken straight from the fridge. The batter made with chilled eggs produced a denser foam and the resulting cake boasted a smooth, velvety texture. And the gentle, moist heat of a water bath further preserved the cake’s lush texture.
Serves 12 to 16
Even though the cake may not look done, pull it from the oven when an instant-read thermometer registers 140 degrees. (Make sure not to let tip of thermometer hit the bottom of the pan.) It will continue to firm up as it cools. If you use a 9-inch springform pan instead of the preferred 8-inch, reduce the baking time to 18 to 20 minutes.