01 - Set oven to 325°F (165°C) and allow to fully preheat.
02 - Pat beef short ribs dry with paper towels. Generously season both sides with salt and freshly ground black pepper.
03 - Heat olive oil in a Dutch oven or heavy oven-safe pot over medium-high heat. Sear ribs in batches until deeply browned on all sides, about 8 minutes total. Transfer browned ribs to a plate.
04 - Add sliced onions, carrots, and celery to the pot. Cook, stirring occasionally, until vegetables are softened and lightly browned, about 6 minutes. Add minced garlic and sauté for 1 minute.
05 - Stir in tomato paste and cook, stirring, for 2 minutes until it darkens in color.
06 - Pour in apple cider and beef broth, scraping up any browned bits from the pot's bottom with a wooden spoon.
07 - Nestle browned short ribs among the vegetables. Add thyme, rosemary sprigs, and bay leaves.
08 - Bring mixture to a simmer, cover tightly, and transfer Dutch oven to the preheated oven.
09 - Braise for 2 1/2 to 3 hours, until beef becomes fork-tender and nearly releases from the bone.
10 - Remove short ribs and vegetables to a serving platter. Skim excess surface fat from the sauce, discard herb stems and bay leaves. Reduce sauce over medium heat on stovetop if desired, then spoon braising sauce over short ribs before serving.