Soak the shallots in water for atleast an hour or two.
This will help to peel the skin easily.Peel the skin thoroughly and if necessary cut it into half.
In a kadai, add gingelley oil and saute the shallots until they become glassy.
Allow it to cool.
Then grind the shallots once and add jaggery, tamarind and salt.
Grind once again so that they get blended well.Again add oil in a kadai, splutter mustard seeds and saute the ground paste.
Once the raw smell goes off add red chilli powder and mix well.
Saute continuously in medium flame.
The colour of the paste turns from light brown to reddish orange colour to dark brown colour.
At one stage it reaches halwa consistency and start leaving sides.
At this stage, turn off the stove.
You can serve this as a side dish for roti, idli and dosai.