Soupe au pistou

Ingredients

1 medium onion

1 small carrot

2 tender inner celery stems

1 small fennel bulb (150–200g)

200g potatoes

2 tbsp olive oil

1 garlic clove

1 litre veg stock

200g courgettes

150g green beans

400g tin haricot beans

Sea salt and black pepper

50g walnuts

A bunch of basil (about 50g)

A small bunch of flat-leaf parsley

1 garlic clove

A pinch of flaky sea salt

1 fat plum tomato (about 75g)