Further to the suggestions from the members—like posters in the dining areas, verbal discussions, etc.—each of which will definitely have a positive effect towards avoiding food wastage—there could be another way of handling it. Since you are located in a Tier-3 city, there would be quite a few orphanages/old-age homes close to your premises. You could tie up with any/some of them to give away the excess food from your canteen—many such institutions accept it, since they know this would be a continuous/daily affair, and they will save money at their end [the logistics can be worked out].
Share the Plan with Employees
Now for the critical part—share with all the employees that the company is planning for such a tie-up and whoever wastes food would only be ensuring that kids/elders would be hit by their wastage. Human psychology being what it is, people, in general, think twice when kids/elders are affected by their actions—much more than they would care about colleagues or those at the same/similar level [age-wise or socially].
Any kitchen usually cooks a few more plates than actually needed—that extra food could go to the institutions—even if all the employees turn into good boys/girls .
Addressing CSR Objectives
This would, in a way, also address your official CSR objectives/obligations—given that the new CSR regulations are being brought in by the Govt. of India in the next Budget.
Regards,
TS