A quick, high-summer recipe that should be eaten as soon as it’s made, this salad makes a great side dish for a barbecue. Ice-cold watermelon is tossed with gochugaru (Korean dried chili flakes), fish sauce, garlic, scallions, ginger and lime juice for an instant sweet, sour, savoury and umami kimchi—no fermentation required.—Melanie Kwan