1. Peel the sweet potatoes and chop into small chunks.
2. Remove the seeds from the Chilli. Chop the chilli and spring onion stalks into thin slices.
3. In a large saucepan hear the oil and add the sweet potatoes , chilli and onion.
4. Gently sweat the vegetables over a medium heat for 15 minutes then add the coconut milk and simmer for 10 minutes.
5. Remove from the heat and ,using a blender (hand or jug), blend the soup until smooth.
6. Finally, pour in a bowl and enjoy.