Nothing can ruin a salad quite like soggy lettuce. Fortunately, lemons can give lettuce a second life. To transform limp greens to their previous more palatable state, simply squeeze a halved lemon into a bowl of cold (but not freezing) water. Then, refrigerate the lettuce in the bowl for about an hour, dry it off, and presto! Like magic, your lettuce is revitalized and ready to be the star ingredient in a fresh, crisp salad. However, if the bag of greens you were hoping to revive is more gelatinous goo than wilted leaves, you should probably forget the salad and start making other plans for dinner.