Red Velvet Cake
["1 box Duncan Hines butter cake mix", "1 tsp. cocoa", "1 tsp. vanilla", "1 c. buttermilk", "1 bottle red food coloring", "1 stick margarine, melted", "3 eggs", "1 Tbsp. vinegar", "1 tsp. baking soda"]
["Mix cake mix, vanilla, buttermilk, coloring, margarine and eggs.", "Blend until moist.", "Add soda and vinegar.", "Beat 4 minutes at medium speed.", "Bake in two 9-inch greased and floured pans at 350\u00b0 for 25 minutes.", "Frost with your favorite cream cheese frosting."]
["cake mix", "cocoa", "vanilla", "buttermilk", "coloring", "margarine", "eggs", "vinegar", "baking soda"]