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Wash and dry all produce. Adjust rack to upper position and preheat oven to 425 degrees. Bring a large pot of salted water to a boil. Trim ends from zucchini, then halve lengthwise. Slice crosswise into ΒΌ-inch-thick half-moons. Halve, peel, and thinly slice onion. Cut tomatoes into 1-inch-thick wedges. Mince garlic.