Pat the beef top round dry with paper towels and season evenly with sea salt and black pepper.
Heat the olive oil in a heavy-bottomed pot or Dutch oven over medium-high heat.
Sear the beef cubes until deeply browned on all sides, then remove from the pot and set aside.
In the same pot, add the pearl onions, sliced carrots, and quartered mushrooms, sautéing until the vegetables begin to soften.
Stir in the minced garlic and tomato paste, cooking for one minute until fragrant.
Pour in the red wine to deglaze the pan, using a wooden spoon to scrape up any browned bits from the bottom.
Return the beef to the pot and add the beef broth, dried thyme, and the bay leaf.
Bring the liquid to a gentle simmer, then cover and reduce heat to low.
Cook for 60 to 90 minutes, or until the beef is fork-tender and the sauce has thickened.
Remove the bay leaf and garnish with freshly chopped parsley before serving.