Kothamalli Chutney goes well with idli/dosa, roti, paniyaram even with vadai. You can prepare mint chutney with this same recipe, just replace the coriander leaves with mint leaves.
Wash and drain coriander leaves, remove the leaves from the stems.
Heat oil in a pan, add urad dal and fry for 2-3 minutes or until golden brown.
Add red chilis and sauté for a minute, and add asafoetida and salt.
Add coriander leaves.
Stir for a couple of minutes, add tamarind piece, and turn off the flame.
Let it cool, and grind it with little water.
For tempering, heat the oil in a pan, add the mustard and when it splutters add the red chillies and turn off the heat immediately.
Mix tempering with chutney.
Serve hot with idli or dosa.