Texas Sheet Cake

Bring 2 sticks of butter, 4 Tbs cocoa and 1 cup water to a boil.  Add 2 cups flour, 2 cups sugar, ¼ tsp salt and 1 tsp soda, mix well.  Add ½ cup sour cream and 2 eggs.  Bake in large pan at 375º for 20-25 minutes.  Bring 1 stick butter, 6 Tbs milk and 4 Tbs cocoa to boil.  Add 1 box confectioner’s sugar, 1 Tbs vanilla and 2 cups whole walnuts.  Frost cake while warm.