Pressure cook the 1st five ingredients with water. When it is cooked put the tamarind into it and close the pan for 5 minutes. Then mash the cooked thoor dhal. Heat oil in a pan and add mustard seeds. . When it starts to pop add cumin seeds & urad dhal and fry for few minutes. Then add the mashed dhal mixture to it and let it boil for few minutes. Add little water if needed. Garnish with chopped coriander leaves.