Add ghee, cumin seeds, turmeric, green chili, minced garlic, curry leaves, diced tomato, rinsed red lentils, kosher salt, and water to the pot. Give a quick stir.
Close the Instant Pot with the pressure valve set to sealing. Select Pressure Cook (Hi) and set the timer for 5 minutes.
Once cooking is complete, allow 5 minutes of natural pressure release, then manually release any remaining pressure.
Stir the cooked lentils with a spatula. Add a little more water if needed to reach your desired consistency.
Stir in fresh chopped spinach until well combined. Select Sauté mode and cook until the dal just comes to a gentle boil.
Serve hot, ideally with fluffy steamed basmati rice.