Water Sponge Cake
Beat the yolk of one egg, add one half cupful of sugar and beat again, add one half teaspoonful of lemon juice and three tablespoonfuls of cold water, then two thirds of a cupful of flour into which one half even teaspoonful of baking powder has been sifted, and lastly the whites of the egg beaten stiff. Bake in shallow pan or in small tins.