Onions are the most commonly known species of Allium[1], a genus that contains a number of other species cultivated as food. Onions are served in various burgers of McDonald's.



  1. Brewster, James L. (1994). Onions and other vegetable alliums (1st ed.). Wallingford, UK: CAB International. p. 16. ISBN 0-85198-753-2.

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