Chocolate Sheet Cake

1/2 cup butter, softened
1/2 cup shortening
4 T. cocoa
1 cup water
2 cups flour
2 cups sugar
1/2 cup buttermilk (or use milk and add 1 T. vinegar and let sit for a few minutes)
1 t. b. soda
1 t. cinnamon
1 t. vanilla
2 eggs beaten
Dash salt

Mix together butter, shortening, cocoa and water, bring to boil.  Pour over flour and sugar, Mix well.  Add buttermilk, soda, cinnamon, vanilla, eggs and salt and mix well.  Bake 20 minutes at 400 in greased and floured jelly roll pan (I use one of those large cookie sheets) Five minutes before cake is done prepare frosting.)
Frosting

1/2 cup butter or marg
4 T. cocoa
1 tsp. vanilla
6 T. milk
4 cups powdered sugar
1 cup nuts

Melt butter, add cocoa, vanilla and milk and bring to boil.  Remove from heat and add powdered sugar and nuts.  Mix well. Frost cake while hot.  Enjoy!"