cabanossi sausage
A thin, smoked and air-dried pork sausage, firm and well seasoned.
In Australia and much of the UK, cabanossi (often sold as kabanos) is found in supermarkets near the cured meats; elsewhere, Polish and Eastern European shops reliably stock it. It keeps well unopened in the fridge.
Substitute:
Another firm smoked sausage such as landjäger or a mild cooking chorizo matches the bite and smokiness; chorizo will make the dish noticeably more paprika-forward.