Coriander Thokku - side dish for dosa

I was kinda bored of eating mint chutney and onion-tomato chutney along with dosa. I started hunting for a new side dish. That is when I came across this dish on the net. I liked the idea. The one I mention below is just one of the ways in which it can be done. There are other variations of the same dish available on the Net.

Ingredients:
Coriander
Few mint leaves
Tamarind
Salt
Green chillies
Onion - thinly sliced

For seasoning:
Oil
Mustard seeds
Cumin seeds
Urad dal
Curry leaves