In 5-quart Dutch oven, cook beef, onion and garlic over medium-high heat 7 to 9 minutes, stirring occasionally, until beef is no longer pink. Add mushrooms; cook, stirring occasionally, 4 to 6 minutes longer or until mushrooms are tender and brown. Stir in broth, tomatoes, grill seasoning, salt and pepper. Heat to boiling; reduce heat. Cook uncovered 10 minutes, stirring occasionally.