INGREDIENTS
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12 large unpeeled garlic cloves, divided
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1 tablespoon chopped fresh rosemary leaves
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Kosher salt
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Freshly ground black pepper
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2 tablespoons unsalted butter, melted
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1 (6-pound) boneless leg of lamb, trimmed and tied
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4 to 5 pounds small unpeeled potatoes (16 to 20 potatoes)
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2 tablespoons good olive oil