Trim any visible fat from the beef eye of round and cut into 1-inch cubes.
Season the beef cubes evenly with sea salt and black pepper.
Heat the avocado oil in a heavy-bottomed pot or Dutch oven over medium-high heat.
Add the beef to the pot and sear until browned on all sides, then remove and set aside.
Lower the heat to medium and add the diced onion, minced garlic, sliced carrots, and halved radishes to the pot.
Sauté the vegetables for 3-4 minutes until the onions are translucent and fragrant.
Pour in the beef bone broth, using a wooden spoon to scrape up any browned bits from the bottom of the pot.
Return the beef to the pot and add the fresh rosemary and thyme sprigs.
Bring the liquid to a gentle simmer, then cover with a tight-fitting lid.
Reduce the heat to low and braise for 60-90 minutes, or until the beef is fork-tender.
Remove the herb sprigs before serving the beef and vegetables with the concentrated braising liquid.