Feather Sponge Cake - cooking recipe

Ingredients

6 eggs (separate out yolks)
1/2 c. water
1 1/2 c. sugar
1/2 tsp. vanilla
1/2 tsp. orange or lemon extract
1 1/2 c. cake flour or 1 1/4 c. regular flour
1/4 tsp. salt
3/4 tsp. cream of tartar

Preparation

Beat egg yolks until thick and lemon colored.
Add water; continue beating until very thick.
Gradually beat in sugar; add vanilla and extract.
Fold in flour that has been sifted with salt, adding a little at a time.
Beat egg whites until foamy.
Add cream of tartar and beat until forms glossy peaks.
Fold into batter. Pour into ungreased angel food cake pan.
Bake at 325\u00b0 for 1 hour. Frost with Butter Frosting.