Today, August 23, 2013, is National Sponge Cake Day. Sponge cake is a cake based on flour, sugar, and eggs which has a firm yet well aerated structure, similar to a sea sponge. Recipe for Sponge Cake 2 large eggs or 3 small 1 cup white sugar 1 cup self-rising flour 1/4 cup cold water or milk 1 teaspoon baking powder Grease angel food cake pan Add eggs to a mixing bowl. Beat well. Add sugar & beat very well. Add cold water & baking powder. Beat. Add flour slowly to the egg mixture & beat until smooth. Pour into a greased pan. Bake at 375ºF for 30 to 35 minutes. See if cake is done by gently touching with your finger. It will spring back & look golden. Bake a few more minutes, if the cake is not done. Cool 15 to 20 minutes before removing cake from pan.