Heat oil in a pan, add mustard seeds and fenugreek seeds.
Once it splutters add curry leaves.
Add sambar powder, coriander powder, salt, and turmeric powder. Combine well.
In a mixer jar, add coconut, chopped onion, jeera, and red chilis. Add water and make it a smooth paste.
Add the coconut paste, bring it to boil for a minute and turn off the flame.