Preheat the Oven: Preheat your oven to 325°F (163°C).
Season the Meat: Season the mock tenderloin with salt and pepper on all sides.
Sear the Meat: Heat olive oil in the Dutch oven over medium-high heat. Once the oil is hot, add the mock tenderloin and sear each side for about 4-5 minutes until browned. Remove the meat and set it aside.
Sauté the Aromatics: In the same Dutch oven, add the chopped onions and minced garlic. Sauté until softened and fragrant, about 3-4 minutes.
Add the Liquids and Seasonings: Stir in the tomato paste, beef broth, and red wine (if using). Scrape the bottom of the pot to loosen any browned bits. Add the thyme, rosemary, and bay leaves.
Braise the Meat: Return the mock tenderloin to the pot, ensuring it is partially submerged in the liquid. Cover with the Dutch oven lid and place it in the preheated oven. Let the meat braise for 2.5 to 3 hours, or until it’s fork-tender and easy to shred.
Rest and Serve: Once cooked, remove the mock tenderloin from the oven and let it rest for 10 minutes. Slice against the grain and serve with the braising liquid. Garnish with fresh parsley if desired.