We do serve Jain food upon request (without onion, garlic, potatoes). You will have to inform your Trek Coordinator in advance so that we can make arrangements on the slope.
Providing Jain food can be difficult on treks like Sandakphu where the staple vegetables are potato and onion. (We try and use as much local produce as possible to reduce packaged food.)
So if you’re trekking to Sandakphu or trekking in Nepal, do confirm with your Trek Coordinator whether it would be possible to provide you with Jain food.