Heat oil in a deep non-stick pan. Add cumin seeds and saute till it changes color. Add ginger strips and green chili and saute for 30 seconds.
Add asafoetida and saute. Add onion and saute till translucent. Add tomato and saute till soft.
Add split black gram, chili powder, turmeric powder, salt and garam masala powder and mix well.
Add 1½ cups water, mix, cover and cook till split black gram is fully done and the moisture evaporates. Switch off heat, add lemon juice and mix well.
Serve hot garnished with coriander sprigs.