Sweet Potato and Coconut Soup (v)

This is from French Polynesia apparently. It smelt very strange whilst it was cooking but actually tasted suprisingly good. It's a quick and healthy recipe that can easily be thrown together after work.

For 4 portions you need:
750g sweet potatoes, diced
2 medium onions, chopped
3 cloves garlic, whole
1/2 tsp each of cinnamon, paprika, nutmeg, cayenne, ground black pepper
handful chopped coriander
600ml veg stock
can coconut milk
oil

Begin by frying the onion in 1 tbsp oil. After about 5 mins add the spices and garlic. Then add the sweet potatoes, coconut milk and stock. Bring to the boil and then simmer for 15-20 mins till the potatoes are cooked. Blend till smooth, reheat and serve garnished with the coriander. Some crusty french bread is good with it too.