Wash and cut onion, tomato & green chillies into small pieces.
Mix tamarind paste with two cups of water and keep aside.
Pressure cook toor dal, chana dal & cut vegetables up to 4 whistles.
Turn of the heat and let it cool, remove the lid and mash it.
Heat oil in a pan add mustard seeds, cumin seeds, methi seeds & red chillies.
Now add tamarind water, turmeric powder, sambar powder & red chilli powder.
Cook for 5 mins, now add dal mix, salt & jaggery and stir well.
Add curry leaves and coriander leaves, let the whole sambar boil for about 10 mins.
Turn off the heat and transfer into a serving bowl and serve with tiffins.