Heat the oil and cook the onions until soft.
Add the sweet potatoes and peppers to the onions, stir then turn down the heat to low and put a lid on.
Let the vegetables sweat for 5 mins or so.
Add the stock and cook until the vegetables are soft, about 15-20 mins.
Whizz up with a hand-held blender, season with salt and pepper, then garnish with coriander.
Ready for the freezer
Divide the mixture into sealable zip lock bags – 1-2 cups per person.
Once cool, label the bag ready for the freezer.
Ready to Eat
Defrost and heat until piping hot. Can be heated in a pan or in the microwave.