In a slow cooker, combine beef, water, tomatoes, bouillon, onion, parsley, salt if desired, thyme and pepper. Cover and cook on low for 7-9 hours or until meat is tender. Add zucchini, cabbage, beans and macaroni; cook on high, covered, 30-45 minutes more, or until the vegetables are tender. Sprinkle individual servings with Parmesan cheese if desired.
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