Cook on the hob/stove for about 30 mins, until lentils are cooked and veg soft. (If using an Instant Pot: cook on high pressure for 12 minutes, and when finished release the pressure naturally or carefully open the valve to quick release the pressure.)
Add the frozen spinach and peas and cook for another few minutes. (For the IP, just add these after it’s cooked and let them naturally defrost in the hot mixture).
Top/garnish with anything you’d like, serve up and enjoy!
Store leftovers in the fridge for a few days, or freeze for the future (you may want to add a bit of extra liquid after defrosting frozen soup).