Onion rings are a form of appetizer or side dish commonly found in the United States, Canada, United Kingdom, Ireland, Australia, New Zealand, South Africa and some parts of Asia, Continental Europe, and Latin America. They generally consist of a cross-sectional “ring” of onion (the circular structure of which lends itself well to this method of preparation) dipped in batter or bread crumbs and then deep fried; a variant is made with onion paste
The exact origins of the onion ring are unknown, but in 1933 a recipe for deep-fried onion rings that are dipped in milk then dredged in flour appeared in a Crisco advertisement in The New York Times Magazine