Sauté Mushrooms and Onions: Melt butter in Dutch oven; add mushrooms and pearl onions, cook down, then set aside.
Cook Bacon: In the same pot, cook bacon until crispy, then set aside on paper towels.
Brown Beef: Add oil and seasoned beef to pot, brown on all sides, dust with 1 tbsp flour, and set aside, leaving juices in pot.
Cook Vegetables: Add diced onions, green onions, and carrots; sauté until soft. Add tomato paste, cooking until deep brown, then sprinkle 3 tbsp flour and stir.
Add Liquids and Simmer: Pour in wine, broth, and bouillon; bring to a boil. Return beef and bacon to pot, add herbs, cover, and bake at 350°F for 2½ hours.
Final Cook and Rest: Add mushroom mix, bake for an additional hour, then let rest covered for 30 minutes before serving. Enjoy!