Wash and slice the eggplants into thin roundels. Keep immersed in water.
In a bowl, mix salt, turmeric powder, coriander powder, Kashmiri red chilli powder and mustard oil. Coat the eggplant slices with this mixture and let them marinate for about 10 minutes.
Heat oil in a skillet and fry the marinated eggplant slices until golden brown on both sides.
Turn off the gas and allow to cool down.
Meanwhile, in a mixing bowl, whisk the yogurt until smooth. Add salt, black salt, sugar, red chili powder, roasted cumin powder and mix well.
Gently fold in the fried eggplant slices into the yogurt mixture.
Heat oil in a pan. Add asafoetida, mustard seeds, curry leaves, and dry red chillies. Let them crackle for a few seconds, then remove from heat.
Pour the tadka over the eggplant raita.
Top with coriander leaves for a fresh touch.
Transfer to a serving bowl.
Enjoy Eggplant Raita chilled or at room temperature.