"Sift together 1 1/3 cups all-purpose flour, 2 tablespoons unsweetened cocoa powder, 1 1/2 teaspoons baking powder, and 1 pinch of salt. Separate egg whites from yolks. Beat the egg whites until frothy and add 1/2 cup granulated sugar, 1 tablespoon at a time, beating well after each addition. Beat the egg yolks with 1/2 teaspoon vanilla extract and 1/2 teaspoon lemon zest. Add 1/2 cup granulated sugar to the egg yolks and beat until well combined. Gradually add 1/3 cup hot water and beat until stiff peaks form. Fold in the whipped egg whites. Fold in the flour mixture until just combined. Pour into a greased tube pan. Bake at moderate temperature for 55 minutes. Turn onto a wire rack to cool. Slice into 3 layers."
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"Sift together 1 1/3 cups all-purpose flour, 2 tablespoons unsweetened cocoa powder, 1 1/2 teaspoons baking powder, and 1 pinch of salt. Separate egg whites from yolks. Beat the egg whites until frothy and add 1/2 cup granulated sugar, 1 tablespoon at a time, beating well after each addition. Beat the egg yolks with 1/2 teaspoon vanilla extract and 1/2 teaspoon lemon zest. Add 1/2 cup granulated sugar to the egg yolks and beat until well combined. Gradually add 1/3 cup hot water and beat until stiff peaks form. Fold in the whipped egg whites. Fold in the flour mixture until just combined. Pour into a greased tube pan. Bake at moderate temperature for 55 minutes. Turn onto a wire rack to cool. Slice into 3 layers."
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