It must be the December mood, but we feel like sharing with you this "green" secret.
1. In a large saucepan over medium heat, cook onion and garlic in 3 tablespoons olive oil for 3 minutes. Stir in potatoes and cook, stirring constantly, 3 minutes more. Pour in water, bring to a boil, and let boil gently for 20 minutes, until potatoes are mushy.
2. Meanwhile, in a large skillet over medium-low heat, cook sausage until it has released most of its fat, 10 minutes. Drain.
3. Mash potatoes or puree the potato mixture with a blender or food processor. Stir the sausage, salt and pepper into the soup and return to medium heat. Cover and simmer 5 minutes.
4. Just before serving, stir kale into soup and simmer, 5 minutes, until kale is tender and jade green. Stir in the remaining tablespoon of olive oil and serve at once.
Now, you just have to call your friends and enjoy "Caldo Verde" the Portuguese green soup.