In a large skillet, cook sausage and onion over medium heat until meat is no longer pink; drain.
In a 5-qt. slow cooker, combine the beans, tomatoes and sausage mixture. In a small bowl, combine the barbecue sauce, ketchup, brown sugar, mustard, steak seasoning and Liquid Smoke if desired. Stir into bean mixture.
Cover and cook on low for 7-8 hours or until heated through. Yield: 16 servings.