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In a large pot or deep skillet, melt the butter with the vegetable oil over medium-low heat. Add the sliced yellow onions and cook, stirring frequently, for 10-15 minutes until they begin to soften and turn light brown on the bottom.

When the onions start to brown and stick to the bottom of the pan, add a splash of water (about 1-2 tablespoons) to deglaze. Scrape up all the browned bits from the bottom of the pan with a wooden spoon. Continue cooking and deglazing with small amounts of water as needed until the onions are deeply caramelized and a very dark brown color. This process can take 20-30 minutes.

Add the pancetta to the pot with the caramelized onions. Increase the heat to medium and cook until the pancetta is crispy, stirring occasionally.

Stir in the minced garlic and cook for 1 minute until fragrant.

Deglaze the pan with the white wine, scraping any remaining browned bits from the bottom. Cook for 1-2 minutes until the wine has mostly evaporated.

Stir in the salt, dried thyme, and fresh rosemary. Mix well to combine.

Add the dry pasta and beef broth to the pot. Stir everything together to ensure the pasta is submerged.

Bring the mixture to a simmer, then reduce heat to medium-low, cover, and cook for 8-12 minutes, or until the pasta is al dente and most of the liquid has been absorbed, forming a thick sauce. Stir occasionally to prevent sticking.

Remove the pot from the heat. Stir in the heavy cream and freshly grated Parmesan cheese until the sauce is creamy and well combined.

Sprinkle the freshly grated Gruyère cheese over the top of the pasta. If desired, use a kitchen torch to melt and slightly brown the Gruyère until bubbly and golden. Alternatively, you can place the pot under a broiler for 1-2 minutes, watching carefully to prevent burning.

Serve immediately, garnished with fresh chopped parsley if desired.


In a large pot or deep skillet, melt the butter with the vegetable oil over medium-low heat. Add the sliced yellow onions and cook, stirring frequently, for 10-15 minutes until they begin to soften and turn light brown on the bottom.

When the onions start to brown and stick to the bottom of the pan, add a splash of water (about 1-2 tablespoons) to deglaze. Scrape up all the browned bits from the bottom of the pan with a wooden spoon. Continue cooking and deglazing with small amounts of water as needed until the onions are deeply caramelized and a very dark brown color. This process can take 20-30 minutes.

Add the pancetta to the pot with the caramelized onions. Increase the heat to medium and cook until the pancetta is crispy, stirring occasionally.

Stir in the minced garlic and cook for 1 minute until fragrant.

Deglaze the pan with the white wine, scraping any remaining browned bits from the bottom. Cook for 1-2 minutes until the wine has mostly evaporated.

Stir in the salt, dried thyme, and fresh rosemary. Mix well to combine.

Add the dry pasta and beef broth to the pot. Stir everything together to ensure the pasta is submerged.

Bring the mixture to a simmer, then reduce heat to medium-low, cover, and cook for 8-12 minutes, or until the pasta is al dente and most of the liquid has been absorbed, forming a thick sauce. Stir occasionally to prevent sticking.

Remove the pot from the heat. Stir in the heavy cream and freshly grated Parmesan cheese until the sauce is creamy and well combined.

Sprinkle the freshly grated Gruyère cheese over the top of the pasta. If desired, use a kitchen torch to melt and slightly brown the Gruyère until bubbly and golden. Alternatively, you can place the pot under a broiler for 1-2 minutes, watching carefully to prevent burning.

Serve immediately, garnished with fresh chopped parsley if desired.
