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Adjust rack to middle position (middle and top positions for 4 servings) and preheat oven to 450 degrees. Wash and dry produce.
Dice potatoes into ½-inch pieces. Trim green beans if necessary. Zest and quarter lemon. Peel and mince or grate ginger until you have 1 tsp (2 tsp for 4). Pick rosemary leaves from stems; mince leaves until you have 1 tsp.