Soak channa dal in water for 3 hours. Then drain the water completely.
Take coconut, green chillies, coriander, asafoetida and salt.
Grind the contents of Step 2 into a paste.
Now grind the channa dal. Don't make it too fine as that makes it hard to fry. If using a mixer, grind for just around 10 seconds to keep it coarse. Add this to the previously obtained green paste.
Create small cookie-shaped formations using the mixture obtained in previous step.
Fry these in boiling oil.
Once fried, spread on kitchen tissues and allow the oil to be absorbed. Enjoy the vadas.