Mayonnaise Cake

2 cups flour
2 tsp baking soda
4 tablespoons cocoa
1cup sugar
1 cup mayonnaise (not salad dressing)
1 cup water
2 tsp vanilla

Mix dry ingredients together then add liquid ingredients.
Bake in 2 x 8" round or square greased and floured pans at 350 for 20 - 25 mins or until cooked Add filling and topping of your choice when cool.