Firstly add 2 tablespoon of oil and heat

When the oil turns hot add  mustard seeds, fenugreek and lets them splutter

Furthermore, add onion and saute well till onion turns translucent and slightly changes color

Add tamarind and mix well for 2 minutes on low flame

Cool completely then pulse without adding water

In the same pan add oil, when the oil becomes hot  add mustard seeds and fenugreek seeds; let it crackle

Turn down to low flame then add asafoetida and chilli powder; give a quick mix

Furthermore, add pulsed onion; mix well

Add oil and mix well

Furthermore, add jaggery and mix well

Add salt and mix well

If required  extra chilli powder and mix well

Cook for 3-4 mins till the  thokku  comes together  and the oil separates

Turn off the flame and cool completely