Soak the lentils in cold water for 15-20 minutes. Drain, rinse and set aside.
Press the sauté button, add the oil and allow it to heat up for a minute. Add the cumin seeds and serrano pepper to the pot. Once the cumin seeds brown, add the remaining ingredients to the pot.
Secure the lid, close the pressure valve and cook for 7 minutes at high pressure.
Naturally release pressure (or wait 15 minutes, then release remaining pressure)
Garnish with cilantro and serve.