Cook cherupayar in 3 cups water & drain the water completely. Make sure that it is not overcooked.
Melt Jaggery by adding 1/4 cup water.
When it melts add coconut, cooked cherupayar, and crushed & cardamom. Mix well. Make sure that the mix is dry. Remove from fire.
Combine plain flour & besan flour. Add little water to this & make a thick batter.
When the mixture (cherupayar+coconut+jaggery) is cool enough to touch, make small balls with the mix. Dip each balls in the batter and make sure it's coated well with the batter.