In a pressure cooker, heat the oil, splutter the cumin. Fry the garlic briefly.
Add the onion and potato and toss. Cook for a couple of minutes.
Add the rest of the ingredients and give it a mix. Close the cooker and cook for one whistle.
Switch off and allow the pressure to go on its own.
Open the cooker and using a hand blender, blend the mixture till smooth.
Adjust the seasoning and enjoy!