Chilled Courgette and Potato Soup

• 1 medium onion, peeled and finely chopped
• 2 tbsp sunflower oil
• 12 oz /

Sweat the onion in the oil in a large saucepan until soft. Add the courgettes and potato to the saucepan, pour on half the stock, bring to the boil, and simmer until the vegetables are tender. Put most of the basil, leaves and stalks, in a blender or food processor, keeping a little for garnish. Pour