Wash and rinse chana dal, couple of times with clean water. Soak 2 cups of chana dal with 4 cups of water for 2 hrs.
Drain completely and transfer chana dal to blender/ grinder. Grind it to coarse paste.
Transfer the ground coarse paste to a mixing bowl. To this add chopped green chillies, curry leaves, coriander leaves, ginger, salt and asafoetida. Mix well.
Now take a small lime sized ball of chana dal mixture. in your palm and flatten them to circular patty. Similarly do it for the remaining mixture just before frying them.
Heat the oil in medium flame. Once oil is hot enough deep fry these patties.
Fry till both sides turn golden brown.
Once done, remove them to the plate with kitchen towel, to soak excess oil.
Serve them hot with a cup of hot tea or coffee.