In a large Dutch oven or soup kettle, place ham, onion, carrots, potatoes, rutabagas, salt and pepper. Add water just to cover; bring to a boil. , Place cabbage on top of vegetables. Reduce heat; cover and simmer for 1 hour or until the vegetables are tender. , Drain. Cut cabbage into wedges; remove core. Serve meat and vegetables with horseradish if desired.