What gives this soup recipe a rich and wonderful depth ... until the onion starts to get translucent. Step 8. Add the sweet potato, ground ginger, and broth plus a cup of water.

Add the onion, celery, leek, garlic, ginger and chilli. Cook slowly, until soft but not coloured. Add the sweet potato and season. Cook for a further 3 minutes. Add the vegetable stock and cook ...

Sweet potato soup is a big bowl of comfort ... Add the onion and carrots and cook until softened. Stir in the ginger, garlic and chilli flakes and fry for 2–3 minutes, or until fragrant.