Genuine sponge cake contains no rising properties, but is made light by the quantity of air beaten into both yolks and whites of eggs, and the expansion of that air in baking. It requires a slow oven. All so-called sponge cakes which have the addition of soda and cream of tartar or baking powder require same oven temperature as butter cakes. When failures are made in Sunshine and Angel Cake, they are usually traced to baking in too slow an oven, and removing from oven before thoroughly cooked.
Sunshine Cake Whites 10 eggs
1 teaspoon lemon extract 11/2 cups powdered sugar
1 cup flour Yolks 6 eggs
Beat whites of eggs until stiff and dry, add sugar gradually, and continue beating; then add yolks of eggs beaten until thick and lemon-colored, and extract. Cut and fold in flour mixed and sifted with cream of tartar. Bake fifty minutes in a moderate oven in an angel-cake pan.
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