Although I used brussels sprouts, you could use shredded cabbage if that's what you had on hand. If you have leftover mashed potatoes, feel free to use those in place of the plain boiled potatoes. You might wonder why I used duck fat AND pork in this recipe. The simple reason is because I had both and wanted to use both up. Duck fat adds excellent flavor, but you can definitely substitute extra bacon grease or butter if you don't have any hanging out in your fridge like I do.
