CLIF bars (available from REI and elsewhere, but not in New Zealand). I seem to recall liking the carrot cake ones and one of the chocolatey ones. Mmmm.

Here in New Zealand we have "One Square Meal". It's two bars made from apricot, oats and nuts and other stuff, which are packaged side by side to make a square shape (about 5" to a side). Each square is a fully balanced meal (it is alleged). It's more like tramping/sporting fodder than survival stuff. I don't think eating three "One Square Meal" packets a day would be good for you after a few days.

A