Texas Sheet Cake
["2 c. sugar", "2 c. flour (all-purpose)", "1 stick margarine", "1/2 c. cooking oil", "1/4 c. cocoa", "1 c. water", "1 tsp. soda", "1 tsp. vanilla", "2 slightly beaten eggs", "1/2 c. buttermilk"]
["Pour into greased 1-inch cookie sheet; bake 20 minutes at 400\u00b0.", "Ice while hot."]
["sugar", "flour", "margarine", "cooking oil", "cocoa", "water", "soda", "vanilla", "eggs", "buttermilk"]