Fry the onions in the oil gently for a few minutes to soften.
Add in the spices and fry for 1 minutes to release their flavour.
Add in the potatoes, water or stock and garlic and let simmer until the potatoes are really soft.
Whizz in a blender until beautifully smooth, adding in anything up to 1/2 litre of boiling water from the kettle to thin it down to your preferred consistency.
Serve with a spoon of fried onions on top if you need a little extra TLC.