Wash well, pat dry the aubergines. Cut them lengthwise, in quarters and rub the salt, chili powder and half the turmeric on them
Line them in a parchment lined baking tray and spray some cooking oil. Bake in a pre-heated oven, for 15-17 minutes or until cooked through, at 180°C. When done, remove and set aside
In a cooking pan, add the mustard oil let it smoke. Reduce the flame and add the nigella seeds, bay leaf, red chilli and the ginger
Once they are well roasted, lower the flame, add the whisked yoghurt, turmeric, coriander powder, chilis and salt. Stir through immediately and continuously
When the oil separates add ¼ cup hot water and the roasted aubergines. Cover and cook for 5-7 minutes
Once the aubergines absorb some curry, turn the flame off. Add the garam masala and the chopped coriander leaves. Keep covered for 5 minutes before serving
Serve the delicious doi begun (Bengali aubergine in yoghurt curry) fresh and hot with some steamed rice. Enjoy!