3 pounds Idaho potatoes, peeled and cut into quarters |
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1 cup packed fresh cilantro leaves |
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1/4 cup packed fresh flat-leaf parsley leaves |
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5 clove garlic, coarsely chopped |
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1/4 cup grated Parmesan cheese |
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Freshly ground black pepper |
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8 tablespoons (1 stick) unsalted butter, at room temperature |
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