In a large bowl, mix flour and sugar. Bring to a boil, the margarine, the shortening, cocoa and water. Pour hot mixture over flour and sugar. Mix until blended. Add sour milk, soda, eggs and vanilla. Pour into a greased 10x15 inch pan.
Bake at 400 degrees F for 20 minutes. For icing: Bring to a boil, the margarine, cocoa, milk. Add the vanilla, powdered sugar and can add nuts, if desired. Pour icing over warm cake.
By Robin from Washington, IA
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