This is a great appetizer or a snack. Usually it is served with coconut chutney . The other ways to use it is - adding it to Mor Kuzhambu (tangy yogurt gravy) or preparing vadai curry (a coconut based gravy with spices). So, here is the recipe for the vadas.
Channa dal - 2 cups
onion - 1 (small,chopped)
green chillies - 6 (finely chopped)
sombu- 1 tsp
Soak Channa dal for 1 hr. drain water and grind it coarsely. In a vessel, combine dal,onions,chillies,sombu,corriander leaves and salt. Shape into vadas and deep fry in oil. Serve with chutney of your choice.