If using tamarind, soak in hot water for 20 mins, extract tamarind juice and adjust the total quantity of water to measure 3& ½ cups.
Heat a kadai with oil. Splutter mustard, add urad dal, toor dal, cumins seeds, curry leaves and asafoetida.
Roast until dals turn golden. Add manathakkali vathal and roast for a minute.
Transfer the content to a heavy bottomed vessel.
Add sambar powder, turmeric, red chilli powder, salt and mix well with tamarind extract.
Boil for 15 mins. Towards end, dissolve rice flour in a tablespoon of water and mix.
Add jaggery, mix well and switch off the flame.