Soak the chana dal in enough water for 1-2hrs. Drain extra water, reserve 1 tablespoon of soaked chana dal and grind the rest into a coarse paste. Don’t add any water.
Add finely chopped onions, green chillies, curry leaves along with salt and chana dal. Mix well.
Next add the ground coarse chana dal , ginger garlic paste and banana blossom. Mix well, the mixture should form a lump easily.
Meanwhile heat oil for deep frying. Make equal sized balls of the vadai mixture.
Pat into medium sized patti/vadai on your palm. Drop gently into oil.
Cook on medium heat until it is golden brown and crisp. Drain off excess oil. Repeat the same with rest of the mixture.
Serve hot with tea/coffee or even as side dish for rice.