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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Trim and halve zucchini lengthwise; cut crosswise into ½-inch-thick half-moons. Trim, peel, and cut carrot on a diagonal into ½-inch-thick pieces. Halve, peel, and cut onion into ½-inch-thick wedges; mince a few wedges until you have 2 TBSP (4 TBSP for 4 servings). Dice tomato into ½-inch pieces.