Colcannon is traditionally made from mashed potatoes and kale (or cabbage), with spring onions, butter, salt and pepper added. It can contain other ingredients such as milk, cream, leeks, onions and chives. There are many regional variations of this dish. It is often eaten with boiled ham or Irish bacon. At one time it was a cheap, year-round staple food, though nowadays it is usually eaten in autumn/winter, when kale comes into season.