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

This meal is a popular breakfast of the British. They also eat kippers in some Asian countries, especially in Japan, where seafood is extremely popular and, due to the geographical location of the country, quite cheap. The Irish also love herrings, as they have a lot of fish as well.

More Info: en.wikipedia.org