Yellow Angel Food Cake
["5 egg whites, beaten stiff", "1/2 c. sugar", "5 egg yolks", "1/3 c. sugar", "1 tsp. vanilla", "1/2 tsp. baking powder", "1/4 tsp. salt", "1 c. sifted flour"]
["Add 1/2 cup sugar to beaten egg whites.", "Add 1/3 cup sugar, vanilla, salt, baking powder and flour to egg yolks.", "Fold in egg whites.", "Bake in ungreased tube pan at 350\u00b0 for 40 minutes."]
["egg whites", "sugar", "egg yolks", "sugar", "vanilla", "baking powder", "salt", "flour"]