In Preserved: Drinks, authors Darra Goldstein, Cortney Burns, and Richard Martin examine the history of food preservation and how to use the technique in everything from brewing beer to infusing vodka. But their homemade pompelmocello (grapefruit liqueur) recipe is ideal for winter holidays, whether to gift or serve after a big meal. It takes about six weeks to make, but the long steeping process of the ruby red grapefruit peels ensures an intense flavor.