Hey Malay,
The mess doesn't provide Jain food, however you'd have to ask the mess people to cook Jain food for you specially as obtaining Jain food is hard. Some canteens won't even know what to cook in Jain food. The only best solution is to start eating food that contains onions, etc.
Hope this helps, all the best.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile