Season the beef short ribs on all sides with sea salt and black pepper.
Heat the avocado oil in a heavy-bottomed pot or Dutch oven over medium-high heat.
Sear the short ribs for 2-3 minutes per side until a golden-brown crust forms, then remove and set aside.
In the same pot, add the diced onion, carrots, and parsnips, sautéing for about 5 minutes until the edges are slightly caramelized.
Stir in the minced garlic and tomato paste, cooking for 1 minute until fragrant.
Deglaze the pot by pouring in the beef bone broth, using a wooden spoon to scrape up any flavorful browned bits from the bottom.
Place the short ribs back into the pot and nestle the rosemary and thyme sprigs among the vegetables.
Cover with a tight-fitting lid and reduce heat to low, simmering gently for 2.5 to 3 hours until the beef is fork-tender.
Discard the herb sprigs and serve the ribs hot, drizzled with the concentrated braising liquid and surrounded by the root vegetables.