- Heat oil in a Dutch oven or large heavy skillet over medium heat. Add guanciale (or pancetta) and sauté until crisp and golden, about 4 minutes.  
- Add pepper flakes and black pepper; stir for 10 seconds. Add onion and garlic; cook, stirring often, until soft, about 8 minutes.  
- Add 1 jar of Monte’s Sauce, reduce heat to low, and cook, stirring occasionally, until sauce thickens, 10-15 minutes. 
- Meanwhile, bring a large pot of water to a boil. Season with salt; add the pasta and cook, stirring occasionally, until 2 minutes before al dente.  
- With a slotted spider spoon (or tongs) move pasta directly to sauce in skillet and toss vigorously to coat.  
- Add 1/2 cup of the reserved pasta water and cook until sauce coats pasta and pasta is al dente, about 2 minutes. (Add a little pasta water if sauce is too dry.)  
- Stir in pecorino cheese and transfer pasta to bowls. 
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