Dirty icing may sound unpleasant, but it is actually a time-saving method commonly used in cake decorating. The dirty ice, or crumb coat, prevents crumbs from getting stuck in the frosting of a cake ...

Smooth all over with the smoother tool. Use a small, sharp knife to trim away the excess icing from the edge of the board (wrap and reserve for cake decorating). Holding the board up is the best way ...