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Adjust racks to top and middle positions and preheat oven to 425 degrees. Wash and dry produce.
Trim and cut green beans into 2-inch pieces. Peel and mince or grate garlic. Peel and dice sweet potatoes into ½-inch pieces. Halve, peel, and dice onion into ½-inch pieces. Roughly chop cilantro. Zest and quarter lime.