In a pressure cooker, add soaked vaal, water, salt and oil. Close lid and cook vaal on a medium flame for 5-6 whistle.
In a pan, add water, tamarind and jaggery. Boil until the tamarind becomes soft. Switch off the flame and sieve tamarind jaggery paste.
Heat oil in a pan; add carom seeds, a pinch of hing, cumin seeds, bay leaf and dry red chilli. Sauté for a minute.
Add gram flour and dry garlic chutney. Sauté till it raw smell goes away.
Add masala paste and roast till it oil separates from it.
Then add tomato gravy and salt. Cover and cook till oil is release from the sides of the gravy.
Then add boiled vaal with water and mix well.
Cover and cook for 4-5 till the gravy thickens.
Add garam masala, tamarind paste and jaggery paste. Mix well.
Now heat oil in a pan and add red chilli powder. Mix well and add tadka on rasawala vaal. Mix well.
Serve rasawala vaal nu shaak with rice and roti.