Texas Sheet Cake

2 cups flour

2 cups sugar

1/2 cup butter or margarine

1/2 cup shortening

1 cup water

1/4 cup cocoa

1/2 cup buttermilk

2 eggs

1 tsp. baking soda

1 tsp. vanilla

Frosting:

1/2 cup butter or margarine

2 tbls. cocoa

1/4 cup milk

3 1/2 cups powdered sugar

1 tsp. vanilla

1. In large bowl, combine flour and sugar.

2. In heavy saucepan, combine butter, shortening, water and cocoa. Stir and heat to boiling.

3. Pour boiling mixture over flour and sugar in the bowl. Add buttermilk, eggs, baking soda and vanilla.

4. Mix well using a wooden spoon or high speed on electric mixer.

5. Pour into well-buttered 17 1/2 x 1 inch jelly roll pan.

6. Bat at 400 degrees for 20 minutes or till brownies test done in the center.

7. While brownies bake, prepare frosting. In a saucepan combine butter, cocoa and milk. Heat to boiling, stirring.

8. Mix in the powdered sugar and vanilla until frosting is smooth.

9. Pour warm frosting over brownies as soon as out of oven.