Lunch is included with ticket... If you are booking through IRCTC then you have to provide your preferred choice of menu Veg/Non-Veg...
But it is not important as though...
Suppose you have checked Veg at the time of booking...
But when on board you preferred having Non-Veg its not a big deal...
You...
more... do not have to do any thing, the catering staff will ask every one for his/her preferred meal...