In a Dutch oven, cook the beef, carrots, celery and onion in oil until beef is browned; drain. Add the broth, garlic, rosemary and pepper. Bring to a boil. Reduce heat; cover and simmer for 12-15 minutes or until beef and vegetables are tender., Combine the cornstarch and water until smooth; gradually stir into beef mixture. Bring to a boil; cook and stir for 2 minutes or until thickened. Add browning sauce if desired.