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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. Zest and quarter lemon. Halve, peel, and mince half the shallot (whole shallot for 4 servings). Strip thyme leaves from stems until you have 1 tsp (2 tsp for 4), leaving remaining sprigs whole.