Sponge Cake
["6 egg yolks", "1 1/2 c. sugar", "1 1/2 c. flour", "2 tsp. baking powder", "6 Tbsp. cold water", "1 tsp. lemon extract", "6 egg whites"]
["Beat egg yolks, sugar, flour, baking powder, cold water and lemon extract. In a separate bowl, beat egg whites until stiff. Fold egg white mixture into cake batter with spoon.", "Use angel food pan. Bake at 300\u00b0 for 1 hour."]
["egg yolks", "sugar", "flour", "baking powder", "cold water", "lemon extract", "egg whites"]