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Adjust rack to top position and preheat oven to 450 degrees. Bring 1 TBSP butter (2 TBSP for 4 servings) to room temperature. Wash and dry produce.
Cut potatoes into ½-inch-thick wedges. Peel and mince garlic. Trim and thinly slice scallions, separating whites from greens; mince whites. Pick and mince fronds from dill. Thinly slice tomato and season with salt and pepper.