What is Pastillage?
Pastillage is a very hard sugar dough used for decorations and show piece work. It can be molded, rolled out, and pressed into forms. It dries very hard and can be sanded if needed to smooth out any rough spots. While just about all recipes will contain powdered sugar and gelatin, most will also have an acid in the form of vinegar or cream of tartar.
Two recipes are listed on PastrySampler.com, link below.