Texas Sheet Cake
["2 sticks margarine", "4 Tbsp. cocoa", "1 c. water", "2 c. sugar", "2 c. flour", "1 tsp. soda", "1/2 tsp. salt", "2 eggs", "1/2 c. buttermilk", "1 stick margarine", "6 Tbsp. milk", "4 Tbsp. cocoa", "1 box powdered sugar (4 c.)", "1 tsp. vanilla", "3/4 c. chopped nuts"]
["In a 2-quart saucepan, combine margarine, cocoa and water. Bring to rolling boil.", "Let cool a few minutes, then add sugar, flour, soda, salt, eggs and buttermilk.", "Beat well and pour in greased and floured 15 x 10-inch sheet pan.", "Bake 20 minutes in 350\u00b0 oven.", "While cake is baking, combine margarine, milk and cocoa.", "Bring to boil.", "Remove from stove and add powdered sugar, vanilla and nuts.", "Beat well.", "Set aside and spread on bars while they are still warm."]
["margarine", "cocoa", "water", "sugar", "flour", "soda", "salt", "eggs", "buttermilk", "margarine", "milk", "cocoa", "powdered sugar", "vanilla", "nuts"]