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Bring a large pot of salted water to a boil. Preheat broiler to high. Wash and dry all produce. Cut zucchini into ¼-inch cubes. Cut mozzarella into ½-inch cubes. Halve, peel, and chop onion. Mince or grate garlic. Pick half the basil leaves from stems and roughly chop (save the rest for garnish).