Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      cups          flour
   1      cup           sugar
     1/2  cup           cocoa
   1 1/2  tsp           baking powder
   1 1/2  tsp           baking soda
   1      cup           ice water -- (+~2 tbsp)
   2      tsp           real vanilla extract -- (+)
   1      cup           real mayonnaise
                        butter frosting:
     1/2  stick         butter
   1      lb            powdered sugar
                        -- (dash salt)
     1/2  cup           cocoa (optional)
   2      tbsp          milk -- (+)
   1      tsp           vanilla -- (+)

Preparation:

Sift together flour, sugar, cocoa, baking powder and baking soda. Add ice water and vanilla extract. When mixed thoroughly, fold in mayonnaise. If you're using a mixer, fold the mayonnaise in by hand. Stir just til mixed; do not overbeat. Pour into a greased and floured (or use cooking spray) 13x9x2 pan and bake 30 minutes at 350 F. Cake is done when it starts to pull away from the sides of the pan and the top starts to crack; you can also use a toothpick test; do not overcook. Cool five minutes before removing from the pan. Butter frosting: Cream butter, 1/2 sugar, and salt. Add cocoa and 1 tbsp milk. Cream. Add sugar and milk til the consistency is right and then beat at mixer's highest speed. Frost cake immediat