Sweet Potato Coconut Soup

2 cups water
1.5cups coconut milk (mix with the water above)
4 tablespoons olive oil
2 onions (chopped)
1 pound of sweet potatoes (peeled and roughly chopped)
2 cloves garlic (crushed)
1/2 inch fresh root ginger (peeled and finely chopped)
¼ red chilli (finely chopped - adjust this to your taste)

Heat the oil in a large pan. Add the onions and cook for about 10 mins over a medium heat. Add the sweet potatoes and cook four about 5-10 minutes. Add the garlic, ginger, and chilli, the coconut milk/water mix. Bring to a fast simmer, but do not let it come to the boil. Reduce the heat, cover and simmer for about 30-40 minutes until the potato is tender Allow it to cool slightly, and either in a blender or with an immersion blender blend the soup.  Gently reheat and serve warm.