Add besan flour, curd, water in mixing bowl. Combine the besan, curds-water mixture, turmeric powder, asafoetida and salt to make a smooth batter (taking care that no lump remains).I skip green chilly paste if you want you can add at this stage.
Transfer this batter in a deep non-stick pan and Cook on a low flame, keep stirring continuously till it becomes thick.Grease a plate(thali) keep next to you once the batter becomes thick you just use the spoon and apply it on the greased plate and wait for a few seconds and try to roll up. If it doesn't, then cook for a few more minutes, and check once more till done.
While the batter is still hot, spread evenly using a spoon, on the reverse greased side of 2 thalis evenly to make a thin uniform strips using a knife.once cools down, cut the khandvi on each thali lengthwise into equal portions and roll up each gently.