Heat olive oil in a large Dutch oven over medium heat. Add stew meat and onion then cook for about 5 minutes. Add garlic and cook for 30 seconds before adding tomatoes, seasonings, and beef broth.
Cover and cook in the oven for at least 3-4 hours, checking occasionally to make sure there is enough liquid. Remove pot from oven place on stovetop over medium-low heat.
Add carrot, green beans, and celery to the stew, and add more beef broth if low. Taste and re-season if needed. Cover and cook for 45 minutes.
Add the broken spaghetti noodles and cook for an additional 10-15 minutes. Serve and enjoy!