In a bowl add gram flour, curd, turmeric powder, salt and crushed ginger chilli paste and mix well. Slowly add in water and make a smooth batter.
In a pan keep sieve on top and sieve the entire batter through it. Put the pan on a stove with full flame till the batter thickens a bit.
Once batter thickens a bit reduce the flame to medium and keep on stirring for 15minutes.
To check that the khandvi is cooked completely take a steel spatula, apply a thin layer of batter on it and wait for a minute if mixture rolls out easily means batter is ready.
Once batter is ready switch off the heat and immediately spread thin layer of the batter on the back side of a steel plate or any flat surface.
Let the mixture cool down for 10-15 minutes. After 15 minutes make long vertical cuts. Make rolls our of the vertical cuts and add tadka on it.