Caldo Verde with Sausage

Description
This recipe taken from www.Portuguese-recipes.com

Ingredients

 * 4 tablespoons olive oil
 * 1 Onion, minced
 * 1 clove garlic, minced
 * 6 potatoes, peeled and thinly sliced
 * 2 quarts cold water
 * 1/2 lb. of linguica Sausage, thinly sliced
 * 2 teaspoons salt
 * ground black pepper to taste
 * 1 pound kale, rinsed and thin cut or julienne

Directions
Meanwhile, in a large skillet over medium-low heat, cook Sausage until it has release most of its fat, 10 minutes.
 * 1) In a large saucepan over medium heat, cook Onion and garlic in 3 tablespoons olive oil for 3 or 4 minutes. Stir in potatoes and cook, stirring constantly, 3 or 4 minutes more.
 * 2) Pour  in water, bring to a boil, and let boil gently for 20 minutes, until potatoes are real mushy.
 * 1) Drain. Mash potatoes or puree.
 * 2) Add the Sausage, salt and pepper into the soup and return to medium heat.
 * 3) Cover and simmer 5 minutes.
 * 4) Just before serving, stir kale into soup and simmer, until kale is tender and jade green.
 * 5) Stir in the remaining tablespoon of olive oil and serve at once.