Portugese Sausage and Potato soup

Bring the water to a boil in a large pot over medium heat. Pierce the sausage links in several places with a fork and add to the pot. Simmer the sausage 15 minutes. Remove sausage from the pot and slice 1/4 inch thick. Add the potatoes and chicken broth to the pot and simmer about 25 minutes until the potatoes are tender. Place 1/2 of the potatoes and liquid in a food processor and puree. Return the puree to the pot. Add the sliced kale and olive oil and simmer about 5 minutes until the kale is tender. Add the sliced sausage to the pot and simmer until heated through. Serve hot.