Buttermilk White Cake
["1 c. sugar", "1/2 c. shortening", "1/2 c. buttermilk", "1 1/2 c. cake flour", "1/2 tsp. soda", "1/2 tsp. cream of tartar", "salt", "3 egg whites, stiffly beaten", "vanilla"]
["Mix soda and cream of tartar with flour.", "Add egg whites last. Bake in 350\u00b0 oven."]
["sugar", "shortening", "buttermilk", "cake flour", "soda", "cream of tartar", "salt", "egg whites", "vanilla"]