INGREDIENTS
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One 1 1/2-pound bag steamable fingerling potatoes
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3 tablespoons olive oil
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3 tablespoons salted butter, plus more if needed
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Two 6-inch stalks fresh rosemary
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Kosher salt and freshly ground black pepper
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1/4 cup finely chopped fresh parsley
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2 cloves garlic, minced or grated on a rasp grater