A flourless cake is essentially a mousse that’s baked and, like a soufflé, allowed to fall in on itself after baking. Virtually all flourless cakes are made with chocolate, because the chocolate functions somewhat like flour and allows the cake to hold its shape. And like a chocolate mousse, air is incorporated by beating egg yolks with sugar, and beating the egg whites separately. Don’t worry if the cake cracks—it should— or if it’s a little runny in the center.
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