"Simmering the balsamic vinegar both mellows and thickens it. When tossed with the hot pasta and the butter, it forms a smooth, uniquely flavored sauce...."
INGREDIENTS
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1 pound asparagus
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1 tablespoon olive oil
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2 teaspoons salt
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1/2 teaspoon fresh-ground black pepper
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1/2 cup plus 2 tablespoons balsamic vinegar
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1/2 teaspoon brown sugar
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1 pound penne
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1/4 pound butter, cut into pieces
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1/3 cup grated Parmesan cheese, plus more for serving