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Heat Cocoa Mixture Grease a 15x10x1-inch baking pan; set pan aside. In a medium saucepan combine butter, water, and cocoa powder. Bring to boiling, stirring constantly. Remove from heat.
Prepare Cake Batter In a large mixing bowl combine flour, sugar, soda, salt, and cinnamon (if desired). Add eggs, buttermilk, and vanilla. Beat with an electric mixer on low to medium speed to combine. Add cocoa mixture and beat until blended. Pour batter into prepared pan.
Bake the Cake Bake in a 375°F oven 20 minutes or until cake springs back when lightly touched.
Prepare Frosting In a medium saucepan stir together butter or margarine, unsweetened cocoa powder, and buttermilk. Cook and stir until boiling; remove from heat. Beat in powdered sugar and vanilla with an electric mixer on low speed until blended. Stir in walnuts.
Top with Frosting Immediately pour hot chocolate frosting over warm cake; spread evenly. Completely cool cake in pan on a wire rack. Cut into squares. Makes 60.