To start with, heat a pan with oil. Add red chillies, asafoetida and urad dal to it.
Roast until dal turns reddish. Drain from oil and keep aside.
In the same oil, add onion and sautee for a minute. Tip in tomatoes and give it a stir.
Add vallarai keerai to the pan and saute in low flame. As you stir, it gets shrunk.
Cook well for 3-4 minutes in low flame.
Actually you can saute in oil separately first and set aside. Then proceed with sauteeing onion and tomato. But I did this way.
Just make sure to cook vallarai keerai well.
Remove in a plate and cool down everything.
Place the cooled items in blender/ mixie and add 2-3 tablespoon of water.
Grind with required salt. Mix in between once for even grinding.
Transfer to the serving bowl.