Prepare the Ingredients: Ensure all ingredients are prepped and ready to go (mise en place).
Caramelize the Onions: Saute the pearl onions until caramelized, then set aside.
Brown the Beef: In the same pan, sear the chuck roast pieces until they develop a golden-brown crust, then set aside.
Deglaze the Pan: Use port wine to deglaze the pan, scraping up the flavorful bits.
Cook the Mushrooms: Add mushrooms to the pan, applying salt to draw out the water.
Combine Ingredients: Return the beef to the pan, adding tomatoes, port wine, fresh herbs, tomato puree, and beef stock.
Simmer the Stew: Let the stew simmer for 2.5 to 3 hours on low heat until the beef is tender.
Thicken the Stew: Thicken the stew using a flour-water mixture, ensuring no lumps form.
Add Final Touches: Stir in the pre-cooked baby potatoes, brussels sprouts, and carrots towards the end to maintain their texture.
Serve: Serve the stew hot, garnished with chopped parsley if desired.