The U.S. Food and Drug Administration has issued a warning to the makers an eggless mayonnaise-like spread called Just Mayo, telling the food company that they cannot call eggless mayo mayo.

The FDA noted that mayonnaise must contain eggs according to its food standard of identity.

Although the food company, Hampton Creek, uses the word “mayo” rather than “mayonnaise,” the FDA wrote in its warning that, “The term ‘mayo’ has long been used and understood as shorthand or slang for mayonnaise.”

Hampton Creek was also sued last year over a similar issue. The maker of popular mayonnaise brand Hellmann’s sued Hampton Creek because its spread did not contain eggs, but the plaintiff dropped the lawsuit after a strong response from Just Mayo supporters.

By Cheryl Bretton