1 c. mayonnaise
1 c. sugar
2 c. flour
4 tbsp. cocoa
1/2 tsp. salt (optional)
1 tsp. vanilla
1 tsp. baking soda (dissolve in 1 cup warm water)

Mix mayonnaise in sugar, flour, cocoa. Add vanilla. Then soda last. Bake at 300 degrees for 1 hour. This is a delicious chocolate cake, not too rich.