In a large dutch oven sear the beef on both sides. Remove the beef and set aside. Add the olive oil and saute the onion, carrot, and celery that are minced small. Add the onions, and carrots and cook for about 5 minutes. Add the garlic and cook an additional 2 minutes. Add the peppers and mushrooms. Stir. Add the beef broth, crushed tomato and red wine. Stir and cook on low partially covered,for an hour. Make a slurry of the corn starch and water. Add to the stew and bring up to a boil. cook until thick. Serve with homemade mashed potatoes. Bon Appetit.