These sugar cookies get their crazy stripes thanks to luster dust, a type of decorating powder used to add shine, sparkle, and color to sweets. Go to nycake.com for a broad selection. Get the recipe:The Most Royal of Icings
Using a pastry bag with a small plain tip, pipe a thin border of royal icing just inside the cookie's edge.
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Fill in with icing, working in concentric circles for rounds, top to bottom for squares. Use an offset spatula to smooth and fill in gaps. Let icing set until firm and dry, at least 2 hours.
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In a small bowl, combine about 1 teaspoon colored luster dust with a few drops of lemon extract, adding more extract as needed until the mixture is the consistency of thin paint. Use a small brush to paint designs onto the icing, blotting brush on paper towel as needed.