Traditional Sponge Cake - cooking recipe

Ingredients

5 to 6 eggs (room temperature), separated
7/8 to 1 c. flour
1 Tbsp. butter or oleo
lemon or orange rind, grated
1 Tbsp. lemon or orange juice
1/2 c. sifted sugar

Preparation

Line 1 loaf pan with wax paper or cookie tin (to use for a jelly roll).