Desserts in jars are fun to make and, of course, to eat, and they are especially suited for gift-giving. They store, travel and stay fresh well, and even can be delivered with a lid on the jar and with gift tags, ribbons, and other embellishments. Olmanson devotes a special chapter to as-yet-unbaked mixes, with the flour, brown sugar, and so on attractively layered in the jar, a timeless idea now undergoing its own revival. Shaina Olmanson shows us how to do it.