Press the sauté button, add oil and allow it to heat up for a minute. Add cumin seeds and serrano pepper to the pot. Once the cumin seeds start to brown, add the remaining ingredients to the pot. 

Secure the lid, close the pressure valve and cook for 5 minutes at high pressure. 

Naturally release pressure or wait 10 minutes, then release pressure. 

Adjust salt to taste and add more water if you’d like a thinner dal. The dal will thicken as it cools so if you are reheating it, you’ll likely need to add more water.