Turn Instant Pot on sauté mode and add some oil. Once it is heated, add mustard seeds and wait for them to pop. Immediately add asafaetido.
Add the black eyed peas and water. Then add the remaining ingredients which include onion, tomato, turmeric, jalapeno, garlic, salt, and cilantro stems (if using kale, collard greens, or turnip greens then add at this point too).
Close the Instant Pot with the lid and set to bean mode (30 minutes high pressure). Put vent on sealing to prevent steam from releasing.
Once the IP timer turns off let it naturally release pressure and cool down on its own.
Open the lid but do not mix yet. Add cilantro leaves and baby spinach at this point (optional)
Mix and serve.
Notes
If you want to kick it up a notch then saute some chopped tomatoes + red chilli powder for a few minutes in a little bit of oil. Top it once the black eyed peas have been cooked.