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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry all produce. Slice potatoes into ½-inch-thick wedges. Halve, peel, and thinly slice onion. Halve lemon. Thinly slice mozzarella. In a small bowl, combine sour cream and ¼ tsp truffle zest (½ tsp for 4 servings; we’ll use the rest later).