- Tue., Apr. 20Online EventApr. 20, 7:00 p.m.Online EventLaurent Ponsot, the Burgundy Iconocast and a key figure in convicting wine fraudster Rudy Kurniawan, has raised doubts on the popular Netflix documentary Sour Grapes. Laurent Ponsot was a low-sulfites maverick and innovator. Then three years ago he broke with his family to start something new.