Preheat the oven to 350 degrees.

In a large bowl mix together the sugar and flour for the cake.

In a medium saucepan mix 1 stick of butter, cocoa, shortening and water.

Bring to a light boil.

Pour over the flour mixture and mix until blended with an electric mixer.

Add buttermilk, eggs, vanilla and soda; mix until blended.

Pour into a greased 11x17 inch pan.

Bake for 20 minutes.

While the cake is baking make your icing.

In a large bowl add the melted butter, milk and cocoa; stir until blended.

Add the vanilla and powdered sugar.

Beat until well blended.

Let the cake sit for 5-10 minutes before pouring icing over.