Brilliant idea! :)
If I were doing it I'd try to provide the following options:
1. wholesale (organic fairtrade) foodstuff
2. retail (organic fairtrade) ingredients for "cook your own" delicious nutritious meals (ideally with an option to use facilities on-site if possible, otherwise at home)
3. (organic fairtrade) restaurant serving meals.
The trick would probably to be to come up with a few easy tasty healthy meals and bulk buy the ingredients. But with input from everyone in the wonderful open source way that shouldn't be a problem :)