2 c. flour
1 1/2 c. sugar
1/2 c. cocoa
1 tsp. baking soda
1 tsp. salt
1 c. mayonnaise
1 c. cold water

Mix in large bowl, dry ingredients. Add mayonnaise and water. Beat until smooth. Grease and flour 9 x 13 inch pan. Bake 30-35 minutes at 350 degrees.