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

Preheat oven to 350 degrees.

Sift dry ingredients together except the soda. Add to mayonnaise - alternately, flour, then water and soda.

Fold in 1 teaspoon vanilla and bake in moderate oven at 350 degrees F.

Bake 30 minutes in greased and floured 11 1/4 x 7 1/2 x 1 1/2 inch pan.