Soak the dals in sufficient water overnight. Grind with required quantity of water till smooth. Heat ghee and oil in a pan and temper with cumin seeds and asafoetida. Saute for a few seconds. Add the ginger and green chilies. Fry for a minute and switch off the flame. Pour this tempering over the ground dal batter. Add rest of the dry spices (except oil) and coriander leaves. Mix well.