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Preheat oven to 425 degrees. Wash and dry all produce. Dice potatoes into ½-inch pieces. Place in a medium pot with enough salted water to cover by 2 inches. Boil until tender, 15-20 minutes. Reserve ¼ cup potato cooking liquid (½ cup for 4 servings), then drain and return potatoes to pot. Meanwhile, zest and halve lemon (halve both lemons for 4).