Wash the whole masoor dal thoroughly in water. Drain the water and set it aside.
Set the Instant Pot to saute mode and add oil. Once it heats, add cumin seeds and saute for a few seconds.
Once the cumin splutters, add onion and fry for 3 minutes. Add ginger, garlic, and green chili. Saute for one more minute.
Add tomato, turmeric powder, chili powder, coriander powder, and salt. Mix well.
Add ¼ cup water. Cover and let the tomatoes cook for 2 minutes.
Add the washed brown lentils. Also, add 6 cups water and mix well.
Close the lid of the Instant Pot and pressure cook for 20 minutes.
Do a natural pressure release for 10 minutes, then do a quick release.
Add garam masala, coriander leaves, Kasuri methi, and lemon juice. Mix well.
Serve hot with rice or roti.