1. Heat oil in a pan and fry chana dal, urad dal, coriander seeds, cumin seeds, dry red chillies and green chillies for 3-4 minutes until the dals turn golden brown.
2. Add the ginger pieces and tamarind and fry for another 2-3.minutes(don't burn the contents)
3. After the mixture cools, grind it in a mixie with required water, salt and jaggery.