Sponge Cake
["3/4 c. cold water", "3 eggs, separated", "1 1/4 c. sugar", "1 1/2 c. flour", "1/4 tsp. salt", "1 tsp. baking powder", "1 tsp. vanilla"]
["Beat egg whites stiff.", "Set aside.", "Put cold water in a large bowl.", "Add egg yolks.", "Beat until light.", "Add sugar and beat 7 minutes (do not fail here; this is the secret of a light cake). Sift flour twice. Add baking powder and salt. Add dry ingredients to egg yolk mixture. Add egg whites. Fold carefully and add vanilla.", "Pour into ungreased tube pan and bake 45 minutes in a 350\u00b0 oven."]
["cold water", "eggs", "sugar", "flour", "salt", "baking powder", "vanilla"]