Mayonnaise Cake
["2 c. plain flour", "1 c. sugar", "3 heaping Tbsp. cocoa", "2 tsp. baking soda", "1 c. mayonnaise", "1 c. water", "1 tsp. vanilla"]
["Mix all ingredients well.", "Bake in greased and floured 9 x 13-inch pan at 350\u00b0 until done.", "(Good with white or chocolate icing.)"]
["flour", "sugar", "cocoa", "baking soda", "mayonnaise", "water", "vanilla"]