Ruth's Texas Cake

Melt:
6 T. cocoa
1 c. water
2 sticks of butter
Mix then add to cocoa mixture
2 c. flour
2 c. sugar
1/2 c. sour cream
1 t. vanilla
1 tsp. soda
1/2 tsp. salt
2 eggs
Place in a large greased cookie sheet with sides. Bake 350 degrees for 20 minutes. As soon as it comes out of the oven put on the frosting.
Frosting:
2 sticks of butter
1/3 c. milk
4 T. cocoa
bring the above to a boil then add 1 tsp. vanilla, 1 lb. powdered sugar and 1 c. chopped nuts (optional)