Pat the beef dry with paper towels and season evenly with the sea salt and black pepper.
Heat the olive oil in a heavy-bottomed pot or Dutch oven over medium-high heat.
Sear the beef until a deep brown crust forms on all sides, then remove the meat and set it aside on a plate.
Add the onion, carrots, and celery to the same pot, sautéing for 5 minutes until the vegetables begin to soften.
Stir in the garlic, mushrooms, and tomato paste, cooking for another 2 minutes until the mixture is fragrant.
Pour in the red wine to deglaze the pan, using a wooden spoon to scrape up all the flavorful browned bits from the bottom.
Return the beef to the pot along with the bone broth, thyme sprig, and bay leaf.
Bring the liquid to a gentle boil, then reduce the heat to low, cover, and simmer for 90 minutes until the beef is fork-tender.