INGREDIENTS
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1/4 cup extra-virgin olive oil
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1 medium onion, minced
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4 garlic cloves, minced
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1 pinch crushed red pepper flakes
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1 28 ounce can peeled tomatoes, puréed in a food processor
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Kosher salt
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3 large fresh basil sprigs
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12 ounces bucatini or spaghetti
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2 tablespoons cubed unsalted butter
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1/4 cup finely grated Parmesan or Pecorino