Crush ⅔ of shallots well in the blender.
Soak the tamarind in about half a cup of warm water
Heat oil in a pan
Add the mustard seeds allow it to splutter
Add the shallots, crushed shallots paste, curry leaves and a pinch of salt
Stir well over medium heat, allow the shallots and paste to cook for about 10~15min
Add chili powder, asafetida, fenugreek powder, jaggery powders, rest of salt, mix well.
Add tamarind extract
Allow to cook over medium to high heat, stir frequently till the water evaporates and oil floats up along the sides of pan
Allow it to cool, store in an air tight bottle and refrigerate
Server with curd rice, dosa or roti