Ok before anyone says something i know you can't cook this in the van but you can take a jar of it once you've made it. http://www.deliaonline.com/recipes/cuisine/european/english/lemon-and-lime-marmalade.html I made it on tuesday - we've ( well mostly me) have eaten a full jar already it's brilliant. My top tip is to use scissors where possible to cut the lemons instead of a knife. bek