To the inner steel bowl of the Instant pot add the toor dal (pigeon pea lentil) and masoor dal (split red lentils) and 3 cups water.Add 1/2 teaspoon turmeric and 3/4 teaspoon salt. Give a stir. Close the lid and press the pressure cook or manual button. Cook on high pressure for 8 minutes with the pressure valve in the sealing position. Let the pressure release naturally. Stove-top pressure cooker: cook on high heat for 2 whistles, then lower the flame and cook for another 7 to 8 minutes or until the lentils are completely cooked. Let the pressure release naturally.