Peanut Butter-Buttermilk Chocolate Cake

Ingredients:

2 C Flour
2 C Sugar
1/2 t Salt
1/2 C Margarine
1 C Water
1/2 C Vegetable Shortening
3 T Cocoa ( heaping )
2 Eggs ( beaten )
1 t Baking Soda
1/2 C Buttermilk
1 t Vanilla 
2 T Peanut Butter

Instructions:

Place in large mixing bowl: Flour, Sugar, and Salt. (Combine Mixture)
Place in saucepan: Margarine, Water, Shortening, and Cocoa. Bring to boil and pour over flour mixture. Mix Well. 
Place in another bowl: eggs, Baking Soda, Buttermilk, and Vanilla. Mix well and add this mixture to hot mixture. Mix Well. 

Bake in greased and floured 9 x 13-inch pan at 350F for 15-20 min. 

While cake is hot spread very thin layer of Peanut Butter on it. (You
may not use all of the Peanut Butter!)

Icing:

1/2 C Margarine
3 T Cocoa ( heaping )
16 oz 1 Box Powdered Sugar
1 t Vanilla
1/2 C Chopped Nuts ( Optional )
6 T Milk

Melt Margarine and Cocoa in saucepan, but do not boil. Mix Well. Take off heat and add powdered sugar, Vanilla, Nuts, and Milk ( add just enough milk to make the icing thin enough to spread). Mix Well. Ice cake while hot.