Here's a step-by-step Instant Pot recipe for vegan Dal Makhani which can be made oil-free
https://holycowvegan.net/instant-pot-vegan-dal-makhani/
A couple links with descriptions of black gram/urad bean
http://indiaphile.info/guide-indian-lentils/
https://en.wikipedia.org/wiki/Vigna_mungo
Info on kasoori methi and substitute: https://www.gourmetsleuth.com/ingredien ... oori-methi