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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry all produce. Drain and rinse chickpeas; pat very dry with paper towels. Cut cauliflower florets into bite-size pieces. Trim, peel, and cut carrots on a diagonal into ½-inch-thick pieces. Trim and thinly slice scallion, separating whites from greens. Zest and quarter lemon.