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