Mayonnaise Cake

(It's really quite good.)

2 c. sugar
3 c. flour
2 lg. eggs
2 t. baking soda
6 t. cocoa powder
pinch of salt
1 c. mayonnaise
1 t. vanilla
1 c. cold water

Mix dry ingredients (get any lumps out of the cocoa) and add the wet ingredients.
Bake in a prepared 9 x 13 pan at 350 degrees F for 40-45 minutes.

Update: Hmmm. It was a bit heavier than my mom's normally is. Next time I want to try a little less flour (say 1/2 c. less) and maybe cake flour.