01 - Preheat oven to 325°F (165°C).
02 - Pat beef short ribs dry with paper towels; season generously with salt and pepper.
03 - Heat olive oil in a large Dutch oven over medium-high heat. Sear short ribs in batches until deeply browned on all sides, about 8 minutes total. Transfer ribs to a plate.
04 - Add onions, carrots, and celery to the pot. Sauté, stirring occasionally, until vegetables are softened and lightly caramelized, about 6 minutes. Add garlic and cook for 1 minute longer.
05 - Stir in tomato paste and cook for 2 minutes to concentrate flavor.
06 - Pour in apple cider and beef broth, scraping up browned bits from the bottom of the pot.
07 - Return seared short ribs to the pot, nestle them among vegetables, and add thyme, rosemary, and bay leaves.
08 - Bring liquid just to a simmer. Cover pot with a tight-fitting lid and transfer to preheated oven.
09 - Cook for 2 1/2 to 3 hours, or until meat is fork-tender and nearly falls off the bone.
10 - Remove short ribs and vegetables to a platter. Skim excess fat from braising liquid. Discard herb stems and bay leaves. Optionally, reduce sauce on the stovetop for desired consistency.
11 - Arrange short ribs on plates with vegetables. Spoon braising sauce over and serve immediately.