Texas man Demery Ardell Wilson alleges that he suffered an allergic reaction after eating a meal at popular US chain Whataburger because of his unusual allergy to onions, TODAY.com reports.

Remarkably, it is the second lawsuit he has brought against a fast food chain over the same issue.

It comes a year after he sued Sonic Drive-In, another popular US chain, with the same lawyer in a case which was ultimately dismissed.

The court filing does not specify what Mr Wilson ate at Whataburger, but its flagship burger is served — like most American fast-food burgers — with onions.

Mr Wilson is seeking between $250,000 (around €222,000 or £187,000) and $1 million (€887,000 or £747,000) in damages over the unwanted alliums.