How to Flow Royal Icing on a Cookie

A sugar cookie is a canvas. Whether it's colorful frosting, clever embellishments, or designs and decorations galore, it all starts with a base of smooth, clean, perfectly flowed royal icing — which isn't nearly as hard to accomplish as you might think. Here, SAVEUR assistant editor Marne Setton shares her simple technique for flowing perfectly: the secret is in a few drops of water.