Coat oil over eggplant, and grill or bake it in an oven or gas stove. Peel and mash eggplant and keep it aside. Fry mustard, urad dhall, red chilli, green chillies, curry leaves and hing in oil. Mix this with mashed eggplant. Add yogurt and salt to the above, and mix everything together. Garnish with chopped cilantro.