Cover kielbasa with water in a skillet, bring to a boil and cook until water evaporates.  Remove sausage, cool and chop.  Add oil, onion, and garlic to skillet and saute until onion is tender.  Add to soup pot along with potatoes an stock.  Bring to a boil and simmer until potatoes are quite tender.  Strain potatoes from stock and mash.  Return to stock with tomatoes, beans, and sausage.  Simmer 5 to 10 minutes, then add escarole.  Simmer another 10 minutes, season to taste with salt and pepper.  Serve garnished with chopped parsley.