- STEP 1
In a large pan, heat the oil, red onion and chilli flakes until soft.
- STEP 2
Add the peeled and chopped sweet potato, spinach and vegetable stock.
- STEP 3
Bring to the boil and simmer for 15 minutes before serving.
- STEP 4
If you prefer a smoother soup, pour into a blender and blitz until desired consistency is achieved.