2 1/4 c. sifted cake flour
1 1/2 c. sugar
3 tsp. baking powder
1 tsp. salt
1/2 c. cooking oil
5 egg yolks
3/4 c. orange juice
1 c. egg whites
1/2 tsp. cream of tartar

Sift together into a bowl; cake flour, sugar, baking powder and salt. Make a well in the center. Add in order cooking oil, egg yolks and orange juice. Beat until smooth. In a large mixing bowl put egg whites and cream of tartar. Beat until whites form very stiff peaks. Pour egg yolk mixture gradually over beaten whites, gently folding with rubber spatula, just until blended. Pour into a ungreased tube pan. Bake at 325 degrees for 55 minutes.