Old Fashioned Sponge Cake

5 Egg Yolks -{beaten very light,
then add;
1 c. Sugar
and beat until very pale straw color.
1/2 c. sifted Flour;
stir in very slowly and lightly.
Add...
5 Egg Whites -{beaten until dry and stiff,
then add;
1 Tbsp. Lemon Juice

No Baking Powder is to be used!