Have you ever squeezed a plump lime, only to have a few paltry drops dribble out? Sometimes the firmness of a lemon or lime can be misleading, yielding little juice. Likewise, citrus that’s been sitting around for a while can dry out. To get more juice, microwave the fruit on high for ten seconds or so, just until it feels warm to the touch. Roll the fruit on the counter, cut, and squeeze. A fresh citrus will produce copious juice, and an older one will give up whatever it’s got.