Caramel Icing
["2 c. white sugar", "1/2 c. brown sugar", "1/2 tsp. soda", "2 sticks margarine", "1 c. buttermilk"]
["Boil together until forms soft ball in cold water. Remove from heat. Add 1 teaspoon vanilla. DO NOT BEAT. STIR."]
["white sugar", "brown sugar", "soda", "margarine", "buttermilk"]