Cook spaghetti until al dente; reserve 1/4 cup of cooking water and then drain pasta.
2.
Meanwhile, heat oil in a nonstick skillet over medium heat; cook bacon until browned. Stir in onion, raise heat to medium-high and cook until lightly browned; stir in red pepper flakes and tomatoes.
3.
Toss hot spaghetti and reserved pasta cooking water with tomato sauce; season to taste with salt and pepper. Yields about 1 1/2 cup per serving.
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