Lightly grease, oil or butter the slow cooker insert.
Place the vegetables in the bottom of the crock pot, top with the meats, and then sprinkle with the garlic and Italian seasonings.
Pour 1 cup each of the beef stock and vegetable/tomato juice over the top.
Cover and cook on low 8 hours; high 4 1/2 to 5 hours.
About 20 minutes before serving:
Stir the soup and add as much of the remaining beef stock and vegetable juice as you like to reach the consistency you prefer.
Add the Worcestershire sauce, salt, and pepper to taste.