01 - Pat the lamb pieces dry with paper towels and season generously with salt and pepper on all sides.
02 - Heat olive oil in a large Dutch oven or heavy pot over medium-high heat. Brown the lamb in batches, ensuring all sides develop a deep sear. Transfer browned lamb to a plate and set aside.
03 - Add onion, carrots, and celery to the same pot. Cook for 6–8 minutes until softened and fragrant, stirring occasionally. Add garlic and cook for 1 minute more until aromatic.
04 - Return the lamb to the pot along with rosemary, thyme, and bay leaf. Pour in the red wine, scraping up any browned bits from the bottom of the pot. Simmer for 2–3 minutes to reduce slightly.
05 - Add crushed tomatoes and broth. Stir well to combine and bring to a gentle simmer.
06 - Reduce heat to low, cover, and cook for 2½ to 3 hours, stirring occasionally. The lamb should become very tender and the sauce should thicken considerably. Remove herb sprigs and bay leaf. Shred the lamb directly into the sauce using two forks. Adjust seasoning if needed.
07 - About 20 minutes before the ragu finishes, cook the pappardelle in a large pot of salted boiling water according to package instructions until al dente. Drain, reserving about ½ cup of pasta water.
08 - Toss the pappardelle with the lamb ragu, adding reserved pasta water as needed to achieve a silky consistency. Serve immediately, topped with grated Parmigiano-Reggiano and fresh parsley if desired.