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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 produce.
Trim and thinly slice scallions, separating whites from greens; mince whites. Peel and mince or grate garlic and ginger. Dice sweet potatoes into ½-inch pieces. Core, deseed, and dice bell pepper into ½-inch pieces. Quarter lime.