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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Dice potatoes into ½-inch pieces. Peel garlic. Cut broccoli florets into bite-size pieces if necessary. Halve, core, and dice apple into ¼-inch pieces. Trim and thinly slice scallions, separating whites from greens. Zest and quarter lemon.