Mix everything (except to temper) in a bowl till a smooth batter is obtained.
Now heat this in a pan with continuously stirring on midium flame till consistency become thick.
Now spread a layer of batter on greese plates.
Cut into 1" stripe and roll them.
Heat tadka pan put oil, musterd seeds , green chilli and curry leaves when they splutter than swich off the flame.
Spread tempering on khandvi and garnish with chopped coriander and grated coconut.
Serve with chutney.