
3 pounds boneless beef chuck pot roast
Salt and black pepper
¼ cup vegetable oil, divided
¼ cup tomato paste
2½ cups beef broth
1 white onion, chopped
2 large carrots, chopped
2 stalks celery, chopped
¼ cup all-purpose flour
4 cups sliced mushrooms
4 cups halved Brussels sprouts
2 cups baby carrots
1 red onion, cut into thin wedges
Fresh thyme