Heat oil in a heavy bottom pan on high flame
Reduce flame on medium
Add green chillies, ginger, garlic, curry leaves, coriander seeds, cumin seeds in oil and fry for 1 minute
Now add gram dal and fry for another 3 minutes or till dal's colour changes
Take out in a bowl add add 3/4 cup water
Soak as it is for 20 minutes
Put this mixture along with water in chatney jar and grind it for 1 minute
Add little more water for smooth grinding
Now add sugar, salt, curd and make fine paste
Sift chatney in a serving bowl
You can add more water as per your preference
Heat rest of oil in a small pan/ temparing pan
Add mustard seeds, chilly and rest of curry leaves
Fry for few seconds
Add it in chatney and mix very well
Enjoy this yummy chatney with Dosa, Idly, Uttapam and Paniyaram