- 1 onion
- 1 large potato
- A head of celery
- 1 bay leaf
- 1 apple
- 1 vegetable stock cube
- A 35g sachet of walnut halves
- 1 tbsp olive oil
- Sea salt and freshly ground pepper
- 800ml boiling water
- Medium pan with a lid
- Heatproof measuring jug
- Frying pan
- Blender or hand-held blender
- 1.
Peel and finely chop the onion. Warm a pan over a low heat for 1 min. Add 1 tbsp oil and the onion. Season. Fry for 8 mins, stirring now and then.
- 2.
Peel and finely chop the potato. Separate the celery sticks and trim the rough top and bottoms off them. Finely slice the sticks.
- 3.
Add the potato and celery to the pan with a bay leaf. Season. Fry for 5 mins, stirring now and then.
- 4.
Peel and quarter the apple. Slice out the apple cores. Roughly chop. Crumble the stock cube into a jug, add 800ml boiling water and stir. Add the apple and stock to the pan. Cover and bring to the boil. Simmer for 15-20 mins till the veg are very soft.
- 5.
Tip the walnuts into a dry frying pan. Toast over a medium heat, shaking the pan, for 2-3 mins. Tip onto a board. Leave to cool, then roughly chop.
- 6.
Remove the bay leaf. Ladle the soup into a blender and blitz until smooth, or use a hand-held blender in the pan. Taste and season. Serve topped with the walnuts.