Wash and soak the dals in water for 2 hours. Add the red chili to this so that it will get soft, which helps in easy grinding.
After 2 hours, drain the water completely. Take 2 tbsp of the soaked dal and keep this aside.
Add the ginger to the mixie jar first and add the soaked dals. Do not add any water.
Pulse this in a mixie into a coarse paste.
Add the finely chopped coriander leaves, mint leaves, and curry leaves and pulse this once.
Transfer this to a wide bowl.
Add salt, asafoetida, the 2 tbsp soaked dal we kept aside and chopped cabbage or onions if using.
Now add 1 tsp of ghee, this gives nice crispiness to the vadai, so do not skip this.
Add salt just before making the vadai.
Heat oil for deep frying.
Take a small lemon-sized portion of the muparuppu vadai batter and flatten it.
Once the oil is hot, keep the flame to medium.
Deep fry on both sides till it becomes golden brown.
Take out from oil and drain in a kitchen towel.
Repeat the same for the remaining batter.