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Adjust rack to upper position and preheat oven to 400 degrees. Wash and dry all produce. Halve zucchini lengthwise, then slice crosswise into ½-inch-thick half-moons. Zest and halve lemon. Peel potatoes, then cut into ½-inch pieces. Halve, peel, and thinly slice shallot. Trim, then thinly slice scallions.