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Preheat oven to 450 degrees. Wash and dry all produce. Bring 2 TBSP butter (4 TBSP for 4 servings) to room temperature in a small bowl. Mince or grate garlic. Trim and thinly slice scallions, separating whites from greens. Halve ciabatta (as if you were making a sandwich). Place peppercorns in a zip-close bag; crush using a rolling pin or heavy-bottomed pan.