This classic Portuguese-style stew combines kale with chorizo and potatoes in a hearty meal in one. Be sure to buy dried chorizo that is fully cooked; you can use fresh sausage instead, but you will need to cook it fully through first. Rather than being made with chicken or other store-bought stock, you make your own broth by pureeing the potatoes with their cooking water, which contains the natural starches from the potatoes.