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Adjust rack to top position and preheat oven to 425. Wash and dry produce.
Peel and quarter sweet potatoes lengthwise; cut into ½-inch-thick quarter-moons. Remove and discard any large stems from kale; chop into bite-size pieces. Drain and rinse beans; transfer to a large bowl and mash about half the beans, leaving some whole. Zest and quarter lime.