Chocolate Texas Sheet Cake

Recipe via Marilyn Peterson
Cake:
Boil in saucepan:
     1 cup butter
     1 cup water
     1/4 cup cocoa

Take off heat and in a mixing bowl add:
     2 cups flour
     2 cups sugar
     1 tsp baking soda
     1/2 tsp salt

Add cocoa mixture to the above and mix

Add:
     1/2 cup sour cream

Mix and pour on large cookie sheet
Bake @ 350* for 25 minutes

Icing:
In saucepan:
     Melt - 1/2 cup butter
     Add - 1/4 cup plus 2 TBSP milk
     Add - 3 TBSP cocoa

Boil stirring
Take off heat and add:
     3 3/4 cups icing sugar
     1 tsp vanilla

Pour over warm cake