Beef Bourguignon

Name: Beef Bourguignon
Ingredients: 1 yellow onion; 2 medium shallots; 2 medium carrots; 4 garlic cloves; 2 sprigs thyme; 5 stems fresh parsley; 2 bay leaves; Sea salt; Fresh ground pepper; 2.5 pounds boneless beef chuck; 1 bottle burgundy wine (drinkable but not too expensive!); 6 ounces slab bacon; 3 tablespoons all purpose flour; 1.5 ounces semi sweet chocolate; 3/4 lb mushrooms; 4 tbsp butter