You’ll Need:Cake 1 pound high quality semisweet chocolate 4 tablespoons water 2 teaspoons vanilla extract 1 tablespoon flour 3 tablespoons granulated sugar 10 tablespoons unsalted butter, softened 4 egg yolks 4 egg whitesDirections : Butter an 8-inch springform pan. Line with wax paper and butter the paper. Set oven rack