When the onion is mostly cooked add in some curry paste, or just add some spices if you don't have paste. Stir around and cook for another minute.
Add about half a large sweet potato, chopped into smallish chunks. Add more if you like thick soup. Stir around a bit.
Cover the whole lot with some stock and simmer until sweet pots are good and soft (doesn't take as long as normal potatoes).
Blend.
Add some cream (optional, is still good without).
Eat.
Nice and easy, you can use a bit less sweet potato and add some carrot/other veg instead. You could also add some creamed coconut after blending instead of cream, if you like that sort of thing.
Sweet potato soup, a standard for me:
Nice and easy, you can use a bit less sweet potato and add some carrot/other veg instead. You could also add some creamed coconut after blending instead of cream, if you like that sort of thing.