Melt over low heat 1/3 cup butter with 1/4 cup water. Remove from heat. Stir in 1/2 cup cocoa. Mix in 2 1/2 cups confectioners sugar, 1 cup at a time. Beat smooth and creamy. Add 1 teaspoon vanilla and a little more water, if needed.

Secret: Work quickly and use immediately. Frosting should be warm so it will pour onto cake which should also be slightly warm.