This is a simple meringue cookie recipe using just two ingredients. Warm the egg whites in a double boiler, gradually adding the granulated sugar in several batches, and whisk until stiff peaks form. Add food coloring and pipe out cute shapes using a piping bag. Bake at a low temperature for a long time to create delicious, crispy meringue cookies. They're also delicious in coffee and are a great treat for beginners.