The batter should be medium thick like dahi vada batter,if you make it thinner then the vada will absorb more oil.
Now add curd, chilies, ginger ,curry leaves and fresh coriander.
Mix it well to make a thick batter of dropping consistency (like dahi vada batter)
Cover and rest for 15 minutes and mix it well to make it smooth.
Heat enough oil in a deep and broad pan to deep fry.
Wet your fingers with water and take lemon size small portions from the batter and drop gently in hot oil.
Lower the flame to medium hot and deep fry to a nice golden color.
Drain on a paper napkin and serve hot.