Heat oil in a pan and add mustard seeds.
When mustard seeds splutter add ured dhal, channa dhal and asafoetida and mix well.
Add slit green chillies and fry for a minute.
Add chopped onions and fry till onions change its colour. Keep in low flame.
Add chopped tomato and fry till tomatoes turn mushy.
Add mint leaves and fry till mint leaves shrink.
Switch off the flame and let it cool down.
Take this in a mixer and add tamarind, grated coconut and salt and grind to a smooth paste.
Pudhina chutney is ready to be served.
You can serve pudhina chutney with idli, dosa, chapati or rice.