Ingredients
Mayonnaise (3/4c), sugar (1c), salt (1/4tsp), baking soda (1 1/2tsp), cocoa (1/2c), flour (2c), vanilla (1tsp) and water (1c).

Method of preparation:-
Take a bowl, sieve flour in it and mix salt, baking soda and cocoa in it. Take another bowl, beat mayonnaise, sugar, vanilla and water in it to form cream. Now add the mixture of dry ingredients to the mixture of creamed ingredients. Mix both the mixtures until it gets well blended. Take a cake pan of 9*13 inch, grease and floured it. Now pour the batter into the greased and floured pan. Place the pan in the oven and bake it for about 25 minutes at 350 degrees F. When the cake gets ready then takes it out from the oven and keeps it to cool.