Black pudding

Black pudding is a distinct national type of blood sausage originating in the United Kingdom and Ireland. It is made from pork or occasionally beef blood, with pork fat or beef suet, and a cereal, usually oatmeal, oat groats, or barley groats. The high proportion of cereal, along with the use of certain herbs such as pennyroyal, serves to distinguish black pudding from blood sausages eaten in other parts of the world. The word pudding is believed to derive from the French boudin, originally from the Latin botellus, meaning "small sausage".

Source: Wikipedia