Yeah but then you'd have to keep potatoes in the van, and change them out every few weeks when they started sprouting, until the time 2 years in the future when you really need something to eat because the ferry didn't turn up and you're stuck on the docks in the middle of nowhere with no place to go to buy something.... Who are you really? Lloyd Grossman? Heston Blumenthal? The reincarnation of Keith Floyd?