I have a feeling I need this in order to freeze something in order to accomplish something else....but I can't seem to be able to get it. Graham says it's too cold! Why can't he just man up and grab it and stash it in his pack quick like Alex did :p
There will come a very distinct point at which you can pick up some iceberg lettuce. It'll be obvious--sounds like you just haven't gotten to that point yet. :)
Maybe it's just that Graham isn't quite as young and tough/foolish as Alex was ;)