Instructions: Sift flour and sugar into a large mixing bowl; set aside.

In a small saucepan, mix margarine, water and cocoa together.

Bring to a rapid boil and pour over sugar and flour. Mix well with a electric mixer. Add buttermilk, eggs, baking soda and vanilla; mix well and pour into greased and floured 18x12-inch sheet pan. Bake 20 minutes at 350 degrees. For icing, in small saucepan, combine margarine, cocoa and milk.

Bring to a boil, remove from heat. Add enough powdered sugar to get a smooth icing texture. Ice cake while hot.

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