I've been asked to make a pudding for an outdoor volunteering activity - in the middle of a field - for 20 people. It needs to be something that travels well, doesn't need refrigerating (although could go in a cool bag) and won't need serving hot. It will be served up after a curry or chilli. I also need to be able to make it the day before.
Any ideas for something easy to make and serve/cheap/and fits the bill will be greatly appreciated.