Combine 1 stick margarine, 1/4 cup cocoa, 1 cup water and oil in saucepan. Boil for 1 minute. Mix flour, sugar and soda together in large bowl. Pour cocoa mixture over dry ingredients, mixing well. Add 1 teaspoon vanilla, 1/2 cup butter milk and eggs, mixing well. Pour into large greased baking pan. Bake at 400 degrees F for 20 minutes. Combine remaining 1 stick margarine, 1/4 cup cocoa and 1/3 cup buttermilk in large saucepan. Bring mixture to a boil. add confectioners' sugar, salt, 1/2 teaspoon vanilla and nuts, mixing well. Frost cake and cut into squares.
This is the only kind of chocolate cake my kids let me make anymore. It's the best I've ever tasted. I always pour the frosting over a still-warm cake. It doesn't last long in my house :-).
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