- Firstly wash  chana dal 
- Add water, red chilli and soak  2 to 3 hrs 
- After the chana dal turn turns soft press, Transfer to a colander and drain the water completely 
- Add soaked dal and red chilli to the mixie jar 
- Furthermore add fennel seed, garlic, ginger, salt, and a pinch of sugar 
- Pulse 4-5 times until the dals are coarse ground. finally, grind in speed 1 and transfer.  If required sprinkle very little water and grind. Avoid pouring water, ground coarse thick vadai  batter 
- Transfer the ground vadai batter 
- Furthermore, add  curry leaves coriander leaves, a pinch of sugar, a green chili, onion, and mix well 
- Heat enough oil in a heavy-bottomed deep pan 
- Grease your hands with water, pinch a small portion of the vadai, and roll. Place it on the other other hand and flatten the vadai with your palm 
- Alternatively, you can grease the parchment paper with oil. Grease your hands with water, pinch a small portion of the vadai, and roll. Place it on the parchment paper  and flatten the vadai 
- Prepare and keep 4-5 vadai based on your pan size for parallel frying 
- When oil is hot gently add the vadai and fry on medium flame 
- After one side is golden flip and fry another side till vadai turns golden and crispy 
- Drain the oil in an oil filter or place a paper towel on a colander