Wash tur daal and boil it. Smash it.
In a kadai, put oil. Add curry leaves, mustard seeds and jeera seeds. Fry for a minute
Add onion and fry till slightly brown.
Add ginger and garlic paste. Fry for a minute. Then add the tomatoes (paste or diced). Cook it till the oil separates.
Add tamarind (not paste) in it. Add turmeric powder and red chilli powder. Cook it for 4 to 5 mins.
Add the smashed tur daal. Add water as per the thickness required. Add saltto taste.
Garnish with coriander leaves.