Method
Start by heating the oil in a large saucepan over a medium heat.
Add the onion and carrots and cook until softened.
Then stir in the ginger, garlic and chilli flakes, and fry these for a couple of minutes until they are fragrant.
Next, stir in the sweet potatoes and stock.
Turn up the heat and bring the pan to the boil.
Reduce the heat to low.
Cover with a lid and simmer for 15 minutes or until the sweet potato is tender.
Either remove the pan from the heat and blend the soup, using a stick blender or a food processor, or mash manually with a potato masher.
Season with salt and pepper to taste and serve with more chilli flakes and/or a handful of crispy onions, which you can buy in most supermarkets. If you’d like to add meat then a few slices of chopped chorizo goes really well with sweet potato.