Royal Icing

A simple mixture of raw egg whites and confectioners’ sugar, royal icing is mostly used for decoration. It works especially well in a paper cone because of its tendency to form ribbons that give it a fluid natural appearance on cakes when you wave the cone over the cake. With a little practice, the easiest way to write on a cake is with royal icing in a paper cone.

Professional pastry chefs make elaborate designs with it.