Red Velvet Cake
["2 1/2 c. flour", "1 c. buttermilk", "1 tsp. vanilla", "1 Tbsp. cocoa", "1 tsp. vinegar", "1 large red food coloring", "1 1/2 c. sugar", "1 1/2 c. oil", "2 eggs", "1 tsp. soda", "1 tsp. salt"]
["Grease and flour 3 nine-inch round pans.", "Bake at 350\u00b0 for 20 to 25 minutes.", "Cool and frost."]
["flour", "buttermilk", "vanilla", "cocoa", "vinegar", "red food coloring", "sugar", "oil", "eggs", "soda", "salt"]