Non-Shrinkable Sponge Cake
["2 1/2 c. cake flour, sifted before measuring", "1 1/2 tsp. baking powder", "1/4 tsp. salt", "2 c. sugar", "4 egg yolks", "1 c. boiling water", "1 tsp. vanilla", "1 tsp. lemon extract", "4 egg whites, beaten stiff"]
["Sift flour, baking powder and salt 3 times.", "Measure 2 cups sugar (reserve 1/4 cup).", "In a large bowl beat until frothy the egg yolks and boiling water.", "Gradually add 1 3/4 cups sugar and beat well.", "Add dry ingredients, vanilla and lemon extract.", "Fold in only until blended.", "Add egg whites (beaten stiff) with the 1/4 cup sugar reserved.", "Fold whites into other ingredients and bake in ungreased angel cake pan 1 hour at 350\u00b0 or until done.", "Makes a very large cake."]
["cake flour", "baking powder", "salt", "sugar", "egg yolks", "boiling water", "vanilla", "lemon extract", "egg whites"]