Noun
colcannon (uncountable)
A traditional Irish dish made from mashed potatoes and cabbage or kale, with scallions, butter, salt and pepper added.
The corned beef and cabbage was outstanding---a first cut of corned beef, slow-cooked for 10 hours with a blend of herbs and spices, served with cabbage, Colcannon potatoes, carrots and parsnips. Source: Internet