Soak chana dal for at least 2-3 hours. Drain all the water and then grind into an almost smooth paste without adding any water. Steam this mixture for 5-7 minutes (just as you would for idlis). Once the mixture has cooled, crumble it using your fingers and add sugar, grated coconut and ground cardamom. Mix well. Take a tablespoon of the mixture and form into round balls.