Three People Toasting with the Japanese Knotweed Beer During the Gastronomical Summit Share Facebook Twitter LinkedIn Pinterest E-mail One of the things on the Gastronomical Summit agenda was a Gastronomical talk, followed by a beer tasting. This beer was made out of Japanese knotweed and it was made by Sander Nederveen, who works at Oedipus. Photo by Jada Maij With: Sander Nederveen, Oedipus Brewing Where was this made?: Gastronomical Summit