Cake: – 2 cups all-purpose flour – 2 cups white sugar – 1 teaspoon baking soda – ½ teaspoon salt – ½ cup sour cream – 2 egg – 1 cup butter – 1 cup water – 5 tablespoons unsweetened cocoa powder Icing: – 6 tablespoons milk – 5 tablespoons unsweetened cocoa powder – ½ cup butter – 4 cups confectioners' sugar – 1 teaspoon vanilla extract – 1 cup chopped walnuts (Optional)
After boiling, remove from heat. Stir in the vanilla and confectioners' sugar, then the walnuts until completely mixed.Ice the heated cake.