Preheat the slow cooker on “HIGH”. Add the hot beef stock, red wine, soy sauce, balsamic vinegar (or Worcestershire sauce), minced garlic, tomato paste, salt and pepper. Give everything a good stir.
Give the stew a good stir. Remove and discard the bay leaves and rosemary. Add the dumplings to the slow cooker, spaced slightly apart. Cover and cook on HIGH setting for an additional hour with the lid on.