01 - Preheat oven to 325°F. Pat the beef short ribs dry with paper towels and season generously on all sides with salt and freshly ground black pepper.
02 - Heat olive oil in a large Dutch oven or heavy ovenproof pot over medium-high heat. Sear the short ribs on all sides until deeply browned, about 3 to 4 minutes per side. Transfer the seared ribs to a plate and set aside.
03 - Add the chopped onion, carrots, and celery to the pot. Sauté until the vegetables are softened, about 5 minutes. Add the minced garlic and cook for 1 additional minute until fragrant.
04 - Stir in the tomato paste and cook for 1 minute. Pour in the red wine, scraping up any browned bits from the bottom of the pot. Bring to a boil and let the liquid reduce by half, about 10 minutes.
05 - Return the seared short ribs to the pot. Add the beef broth, thyme sprigs, rosemary sprigs, and bay leaves. The liquid should come up almost to the top of the ribs. Bring everything to a gentle simmer.
06 - Cover the pot with a tight-fitting lid and transfer to the preheated oven. Braise for 2 hours 45 minutes to 3 hours, or until the meat is fork-tender and falling off the bone.
07 - Carefully remove the ribs and vegetables to a serving platter. Discard the herb sprigs and bay leaves. Skim excess fat from the surface of the braising liquid, then reduce the sauce on the stovetop over medium heat until it reaches the desired consistency.
08 - Serve the short ribs hot with the reduced sauce spooned generously over the top. Pair with creamy mashed potatoes, polenta, or crusty bread.