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Step 1: Slice and add onions to pot with oil and butter.
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Step 2: Caramelize onions for 10-15 minutes, deglazing with water as needed.
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Step 3: Add pancetta and cook until crispy.
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Step 4: Add garlic and mix with onions and pancetta.
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Step 5: Deglaze with white wine.
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Step 6: Add salt, thyme, and rosemary.
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Step 7: Add pasta and beef broth.
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Step 8: Add heavy cream and parmesan.
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Step 9: Top with fresh Gruyère.