Cut the brinjals into fours lengthwise. Soak them in water with a teaspoon of salt so that they do not colorize.
Mix tamarind paste in 1/2 cup of water and keep aside.
Heat the mustard oil to the smoking point. Let it cool a bit. Fry the brinjals in batches until they color slightly. Do not overcook. Remove and keep aside.
Leave about 2 tbsp of oil in the pan. Remove the rest. Add asafoetida, cloves, black cardamoms, green cardamoms, cinnamon, cumin seeds, and green chillies. Allow them to crackle.
Add in the Kashmiri red chilli powder and turmeric powder. Mix.
Next, add well-beaten curd and mix well. Continue to stir. Add salt. Cook until the liquid dries a bit and the oil begins to appear on the sides.
Add in the fried brinjals and saute for a minute. Add 1/4 cup water and cook for a few minutes.
Now add in the fennel powder and dry ginger powder with the tamarind water.
Reduce the heat. Cover and cook for a minute. Check the salt and add more if required. Adjust the gravy as per your taste.
Chok Wangun or Kashmiri-style Tangy Brinjals is ready to serve. Serve hot with boiled rice.