Heat a pan at low heat and add oil in it.
Neat add urad dal and chana dal in it.
Roast it for 30 seconds, add coriander seeds, dry red chillies and roast on low flame till golden brown.
After some time increase the flame to medium and roast till chillies are crisp.
In the same pan add oil again next add garlic cloves, curry leaves, onion and cook till onion is golden pink.
Once onion is slightly cooked add salt, mix and let onion cook.
Once onion is cooked add tamarind mix and let it cook a bit.
Next add cooked dry red chillies, dals and coriander seeds.
Mix well and turn the heat off.
Once mixture is cold completely transfer it to a grinder without adding oil.
Next make a tadka by heating a pan on medium high.
Add oil, once oil is bit hot add asafoetida, mustard seeds and let it crackle.
Turn off the heat and add curry leaves in it.
Add tadka to the chutney.