Texas Sheet Cake

Cake:
1 cup butter
1 cup water
4 heaping Tbsp cocoa
2 cup flour
2 cup sugar
2 eggs
1/2 tsp salt
1/2 cup sour cream
1 tsp baking soda

Frosting:
1 stick butter
6 Tbsp milk
4 Tbsp cocoa
1 pound powdered sugar
1 tsp vanilla
1 cup chopped nuts

To make cake:
Combine butter, water and cocoa in pan.  Heat to boiling, stirring well.
Remove from heat and add flour, sugar and salt.
Mix together until well blended.
Mix in sour cream, baking soda and eggs.
Pour into greased cookie sheet (15x11x1/2")
Bake about 20-25 minutes in 375 degree oven. 

To make frosting:
Combine butter, milk and cocoa in pan.  Heat to boiling, stirring well. 
Remove from  heat and add sugar, vanilla nd nuts.

While frosting is still hot, spread over the hot cake. 
Cool.
Cut into squres and refrigerate.