Kipper

A kipper is a whole herring, a small, oily fish, that has been split into a butterfly fashion from tail to head along the dorsal ridge, gutted, salted or pickled, and cold-smoked over smouldering woodchips (typically oak).

In the United Kingdom, Belgium, The Netherlands, The Isle of Man, Japan, and a minority of North American regions, they are often eaten for breakfast. They are also popular in Ireland. In Great Britain, kippers, along with other preserved smoked or salted fish such as the bloater and buckling, were also once commonly enjoyed as a high tea or supper treat, most popularly with inland and urban working-class populations before World War II.