Chocolate Cookie Sheet Cake

Chocolate Cookie Sheet Cake
Preheat oven to 350 and grease and flour your cookie sheet.
Bring to boil in a sauce pan:
2 sticks margarine
1 c water
4 T heaping cocoa

add :
2 c sugar
2 c flour
1/4 tsp salt
1 t soda
2 eggs
1/2 sour cream

pour into cookie sheet and bake for 20 min. as soon as it is done, begin the frosting:

Bring to boil:
1 stick margarine
6 T milk
4 T cocoa
1 t vanilla
1 c nuts
then add 1 box powdered sugar
then spread on cake, still on cookie sheet, while it is still warm. Serve from the cookie sheet. Serve with vanilla ice cream.