Method:
Take gram flour, turmeric powder, chilli and ginger paste, hing and salt to taste in a microwave safe bowl and mix well. Add butter milk to the mixture and mix well with a egg beater or spatula taking care that no lumps is formed. The batter should be thin and flowing without any lumps.
Place the bowl in a microwave and cook at high speed for 5 mins. Remove the bowl and mix the contents well.
Mean while, keep ready 2-3 steel plates or glass chopping board as I have used and a spatula to spread the batter. Don’t grease them with oil.
Place again in a microwave and cook uncovered for another 5 mins. Mix well and check if you can spread them thinly on the back of steel plates or glass chopping board. If the mixture is still runny, place it again in microwave and cook for another 2-4 mins.
Spread the thick batter quickly on the back of steel plates or glass chopping bowl. Spread it as thinly as possible.
Let it cool for 2-3 minutes. Then slice them with knife into 2 inch long stripes and roll each stripe neatly. Place each rolls in a serving dish.
For tempering, heat oil in a skillet and add mustard seeds to it. When mustard starts to pop and splutter, add chopped green chillies and sauté it for few seconds.
Spread them evenly over rolled Khandvi. Serve them immediately garnished with coconut grates and chopped coriander leaves and enjoy.