Lion House Chocolate Sheet Cake

This is Brandon's favorite dessert!! We always make it for his birthday cake!!

Cake:
2 cups flour
2 cups sugar
1/2 cup butter or margarine, softened
1/2 cup shortening, softened
4 tablespoons cocoa
1 cup water
1/2 cup buttermilk
1 teaspoon baking soda
1 teaspoon vanilla
2 eggs, beaten
Dash salt

Frosting:
1/2 cup butter or margarine
4 tablespoons cocoa
1 teaspoon vanilla
6 tablespoons milk
4 cups powdered sugar
1 cup chopped nuts

Cake:
Preheat oven to 400. Grease and flower a 10X15-inch jelly-roll pan. Set aside.

In a large bowl, sift together flour and sugar. Set aside. In a medium saucepan, mix together butter, shortening, cocoa, and water and bring to boil. Pour over flour and sugar mixture. Mix well. Add buttermilk, soda, cinnamon, vanilla, eggs, and salt; mix well. Pour into jelly-roll pan and bake for 20 minutes. Five minutes before cake is done, prepare frosting.

Frosting:
In a medium saucepan melt butter; add cocoa, vanilla, and milk, and bring to a boil. Remove from heat and add powdered sugar and nuts. Mix well. Frost cake while hot.