Texas Brownies

I LOVE these. If there is a get together I almost always bring these. They are more like a very moist cake than a brownie, if you haven't had them before. I think they taste better cool than hot. Mmmm, I am salivating thinking about them....

2 cups flour
2 cups sugar
1/2 cup (1 stick) butter
1/2 cup shortening
1 cup water
1/4 cup cocoa powder
1/2 buttermilk or sourcream (I have done both and both turned out good)
2 eggs
1 tsp baking soda
1 tsp vanilla

Frosting:
1/2 cup (1 stick) butter
2 Tbl cocoa powder
1/4 cup milk
3 1/2 cups powdered sugar
1 tsp vanilla

In a large mixing bowl, combine the flour and the sugar. In a heavy saucepan, combine butter, shortening, water, and cocoa. Stir and heat to boiling. Pour boiling mixture over the flour and sugar in the bowl. Add buttermilk, eggs, baking soda and vanilla. Mix well, using a wooden spoon or high speed on electric mixer. Pour into a well buttered 17X11 inch jelly roll pan. Bake at 400 degrees for 20 minutes or until done in the center. While brownies bake, prepare the frosting. In a saucepan combine the butter, cocoa and milk. Heat to boiling, stirring. Mix in the powdered sugar and vanilla until the frosting is smooth. Pour WARM frosting over brownies as soon as you take them out of the oven. If the frosting cools too much it will become too thick to pour! Cool before cutting.