5 large eggs.
1½ cups granulated sugar.
1½ cups flour.
⅓ teaspoonful cream of tartar.
1 teaspoonful lemon extract.
Beat the yolks very stiff. Add pinch of salt to the whites, beat a
little, then add cream of tartar and beat stiff. Then stir in gently
the sugar and vanilla, and the beaten yolks, then fold in the flour and
bake in a very moderate oven. This makes a delicious sponge cake.