Stephan, I understand that wasting food was a concern for you last year. I was one of the wasters because I am on a low-carbohydrate diet and could eat very little of what was offered. I ended up going down to the fast food restaurant and ordering a burger & discarding the bun.

I would like to suggest a couple of alternatives for Javapolis. You can possibly offer alternative lunches with fruit, cheese, and meat. If that is too difficult or expensive (it probably will be) you can offer a check-off box on the registration form for conference attendees who don't want or need the lunch.
Cheers,

Don