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Adjust rack to top position and preheat oven to 450 degrees. Bring a large pot of salted water to a boil. Wash and dry produce.
Trim and halve zucchini lengthwise; cut crosswise into ½-inch-thick half-moons. Peel and mince or grate garlic. Trim and thinly slice scallions, separating whites from greens. Zest and quarter lemon.