I leave the potatoes and apples unpeeled for added fiber and nutrition, but you can peel if you prefer.
I think this dish would be extra delicious with fire-roasted canned tomatoes if you have some on hand.
I use Honey Crisp apples for their sweetness and crunch, but I believe any apple would be dandy in its place. Maybe even the newly released Cosmic Crisp!
To save yourself some time you could replace the cabbage with pre-cut bagged cabbage, green or red.