Chiffon Cake
["2 c. flour", "1 1/2 c. sugar", "3 tsp. baking powder", "1 tsp. salt", "1/2 c. vegetable oil", "7 egg yolks", "3/4 c. cold water", "2 tsp. vanilla", "2 tsp. grated lemon rind", "7 egg whites", "1/2 tsp. cream of tartar"]
["Preheat oven to 325\u00b0.", "Blend flour, sugar, baking powder and salt in bowl.", "Make a well and add in order: oil, egg yolks, water, vanilla and rind.", "Beat with spoon until smooth.", "Beat egg whites and cream of tartar in a large mixing bowl until the whites form very stiff peaks.*", "Pour egg yolk mixture over egg whites, gently folding with a rubber spatula just until blended.", "Pour into ungreased tube pan.", "Bake at 325\u00b0 for 55 minutes, then at 350\u00b0 for 10 to 15 minutes more.", "Let it hang until cold."]
["flour", "sugar", "baking powder", "salt", "vegetable oil", "egg yolks", "cold water", "vanilla", "lemon rind", "egg whites", "cream of tartar"]