For bone broth, add all ingredients and boil for 30 min in a crock pot. After, turn to low and continue cooking for 24 hours. After strain and add the rest of the ingredients. Stir beef stock, tomato sauce, water, onion, carrot, barley, mushrooms, and garlic together in a slow cooker. Season beef chunks with garlic salt, salt, and black pepper; add to the beef stock mixture. Add bay leaves to the slow cooker. Cook on Low until the soup thickens and the beef is tender, about 6-8 hours. Remove and discard the bay leaves to serve.