Sweet potato and ginger soup is a hearty vegetarian soup made using fresh vegetables and lentils and seasoned with fresh ginger. It can be prepared in advance and stored in the fridge for up to a week.
Peel and dice the sweet potatoes, finely chop the onion, peel and finely chop or grate the ginger, dice the carrots and chop the celery.
Heat the olive oil in a large saucepan and lightly cook the onion and ginger for a few minutes.
Add the sweet potatoes, carrots, celery lentils, stock cube and seasoning. Add enough water to cover the ingredients plus extra to also allow for the lentils to bulk while they are cooking. Add extra water if needed.
Bring to the boil, then simmer for about 30 minutes until the vegetables are cooked and the lentils are soft.
Remove from the heat and blend using a hand blender.