Soak the tamarind in water(hot water will be faster & easier) and extract the juice from it
Chop the onion,tomato & green chillies and keep them aside
Grind the grated coconut & cumin seeds into a fine paste and set it aside
Pressure cook Thoor dhal & radish till the radish becomes well cooked. Keep them aside
Heat oil in a kadai, add mustard seed,fenu greek seed & urad dhal. Allow them to splutter. add curry leaves and fry for 5 seconds
Now add the onion,tomato & green chillies and fry till they become tender
Pour the tamarind extract to this and add turmeric powder , asafoetida & sambhar powder and leave it to boil for 3 min
Now add the mashed Thoor dhal& cooked radish.
Then add the ground paste and again leave it to boil for 5 - 10 min
Garnish with some coriander leaves