Portuguese Kale Soup (Caldo Verde)

1/4 cup olive oil, in all
1 cup chopped onion
2 teaspoons chopped garlic
2 cups potatoes, peeled and thinly sliced
2 quarts water
6 ounces chorizo (or other) sausage
Salt and black pepper
1 pound kale, washed, trimmed of the thick stems and thinly sliced.

In a medium soup pot, heat 3 tablespoons of olive oil, add onions and garlic and cook for 2 to 3 minutes until they turn glassy, don't let them get brown. Add potatoes and water. Cover and boil gently over medium heat for 20 minutes.

Meanwhile, in a skillet cook sausage until most of the fat is rendered out. Drain and reserve. When the potatoes are tender mash them with a potato masher right in the pot. Add sausage to the soup, and then add the kale. Simmer for 5 minutes. Add the remaining olive oil and season. Ladle into bowls and serve.