It is said to have been a favourite of Jonathan Swift, and it turns up in the Dublin writing of James Joyce and Seán O'Casey.
Pork sausages and rashers are layered with sliced potatoes and onions, then gently simmered rather than fried, so nothing browns and everything stays soft and pale. It's traditionally a Saturday-night dish, but market cafes and pubs across Dublin serve it year-round in big, cheap bowlfuls.