Carnival foods could be regarded as a worldwide phenomenon, if the word "carnival" is taken in its wide sense, meaning any occasion of riotous revelry. However, in the narrower and more commonly used sense it refers to the day or week before Lent and especially Shrove Tuesday (Mardi Gras), when Christians bid farewell to meat for 40 days.
Carnival (a term derived from two Latin words meaning "meat, goodbye") is celebrated most noticeably in Roman Catholic countries such as Italy, Spain, France, where various cities hold traditional processions with dancing, mummers, masks, lights, special street foods, etc. The custom traveled to the New World and is conspicuous in New Orleans and Rio de Janeiro for example. However, some would say that the calypso and carnival tradition in Trinidad (and Tobago) eclipses by its size and exuberance anything else in the world. DeWitt and Wilan (1993) provide a vivid description of carnival time in Trinidad and of the street foods consumed by the revellers...
Which of the carnival foods enjoyed in modern times can be traced back to pagan times is an interesting question. One obvious candidate is the pancake ... Another is the fritter. An 18th-century poem entitled, "The Oxford Sausage" neatly pairs these items:Let glad Shrove Tuesday bring the pancake thin
Or fritter rich, with apples stored within.The Oxford Companion to Food by Alan Davidson