Henriette Waal and Sander Nederveen Showing the Participants how the Juicer Works Delen Facebook Twitter LinkedIn Pinterest Email During the gastronomical summit there were several workshops you could participate in. One of them was making knotweed juice in the workshop "Knot Your Average Juice" with Henriette Waal & Sander Nederveen. Photo by Jada Maij Met: Henriette Waal, Sander Nederveen Waar is dit gemaakt? Gastronomical Summit