To make a sponge cake you will be required to make a mixture of eggs, margarine, baking powder, flour and sugar. After baking you can tell a layer is cooked by pressing lightly on the centre; if it springs back up it is ready.
1. Cool the sponge cake on a wire rack completely before storing. Frost if desired. Chocolate and powdered sugar frosting freezes well. Glazes and icing without butter or shortening don't freeze well, so apply it immediately before serving the sponge www.ehow.com