Texas Sheet Cake
["2 sticks margarine", "1 c. water", "4 Tbsp. cocoa", "2 c. flour", "2 c. sugar", "1 tsp. salt", "1 tsp. baking soda", "2 eggs", "1/2 c. sour cream", "1 stick margarine", "4 Tbsp. cocoa", "6 Tbsp. milk", "1 c. chopped nuts", "1 lb. confectioners sugar", "1 tsp. vanilla"]
["Bring to a boil margarine, cocoa and milk.", "Remove from heat and add nuts, confectioners sugar and vanilla.", "Frost as soon as icing is taken from heat; warm."]
["margarine", "water", "cocoa", "flour", "sugar", "salt", "baking soda", "eggs", "sour cream", "margarine", "cocoa", "milk", "nuts", "confectioners sugar", "vanilla"]