This stew comes together pretty fast, all things considered. If you use canned white beans, you can make it in 45 minutes -- and this is easy enough to make on a weeknight. Try to find real Portuguese sausage for this, whether it's linguica or chourico. A Spanish chorizo or longaniza would be good, but not a Mexican chorizo -- the spices are very different. In a pinch you can use hot Italian sausage. And chances are you've never even heard of Portuguese cabbage. I have never seen it in markets; I love it so much, I grow it myself. Thankfully, regular ole' collard greens are a great substitute. If you can't find collards, I'd use Italian black kale or a dark savoy cabbage. Chard will do as a last resort.