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Adjust rack to top position and preheat oven to 450 degrees. Bring a medium pot of salted water to a boil. Wash and dry all produce. Trim and halve zucchini lengthwise; cut crosswise into ½-inchthick half-moons. Halve tomatoes; cut into ½-inch-thick wedges. Halve, peel, and thinly slice shallot. Mince garlic.