Linguine with Onion, Bacon, and Parmesan

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Ingredients

1. 1/2 pound sliced bacon, cut crosswise into 1/2-inch strips
2. 2 onions, sliced thin
3. 1/2 teaspoon dried thyme
4. 1/8 teaspoon dried red-pepper flakes
5. 1 teaspoon salt
6. 3/4 pound linguine
7. 1/2 cup grated Parmesan cheese, plus more for serving
8. 2 tablespoons chopped fresh parsley
9. 1/2 teaspoon fresh-ground black pepper

1. In a large frying pan, cook the bacon until crisp. Remove the bacon with a slotted spoon and drain on paper towels. Pour off all but 2 tablespoons of the bacon fat. Put the pan over moderate heat. Add the onions, the thyme, the red-pepper flakes, and 1/4 teaspoon of the salt. Cook, stirring occasionally, until the onions are brown, about 10 minutes. Remove from the heat.
2. In a large pot of boiling, salted water, cook the linguine until just done, about 12 minutes. Reserve 1 cup of the pasta water. Drain the linguine and toss with the bacon, onions, 3/4 cup of the reserved pasta water, the Parmesan, parsley, the remaining 3/4 teaspoon salt, and the pepper. If the sauce seems too thick, add more of the pasta water. Serve with additional Parmesan cheese.