To make your own henna cookies, you need a bad-ass recipe for royal icing. I used the recipe from <a href="http://amzn.to/1cEEGoW">The Art of the Cookie</a>, a must have for your cookbook collection. There are gorgeous photos and the recipes are outstanding.
Learn how to make royal icing from scratch. You can make this easy royal icing recipe with three ingredients: meringue powder, confectioners’ sugar and water. This smooth, hard-drying icing is perfect for making decorations in advance and that last. It is also useful as a "cement" to fasten decorations together.