Yes, it's true, June 19 is officially Mustard Day in the city of Los Angeles.
The president of the Los Angeles City Council, Herb J. Wesson took to Twitter to make the announcement via a video on Twitter as he wrote:
"Join us this Wednesday at City Hall (200 N. Main St) at 10 am as we declare June 19, 2019 @mustard Day in the City of Los Angeles!"
Congratulations Mustard!