Method
Prep:4hr20min  ›  Cook:25min  ›  Ready in:4hr45min 

1. Pour the stock into a large saucepan and add the carrots, potato, leeks and orange zest. Bring to the boil over a high heat, skimming the surface as necessary, then reduce the heat to moderate and leave the soup to bubble for about 20 minutes or until all the vegetables are very tender.
2. Remove and discard the strips of orange zest. Purée the soup in a blender or food processor until smooth.
3. If serving the soup hot, return it to the rinsed-out saucepan. Reheat and add the orange juice, then adjust the seasoning. Ladle the soup into bowls and add a spoonful of cream to each, drizzling it over the surface. Sprinkle with the parsley and shredded orange zest and serve at once.
4. To serve the soup chilled, leave to cool, then chill for at least 4 hours. When ready to serve, stir in the orange juice, then adjust the seasoning. Garnish and serve as for the hot soup.

Some more ideas

To make a filling broccoli soup, replace the carrots with 500 g (1 lb 2 oz) broccoli florets. Sprinkle each serving with a little grated nutmeg and top with about 1 tbsp crumbled blue cheese, such as Stilton. Omit the cream. * Make a green bean soup using this basic recipe. Replace the carrots with 450 g (1 lb) green beans, trimmed and chopped. Omit the orange zest and add 30 g (1 oz) finely chopped fennel, about ¼ bulb. Depending on the choice of beans, this soup may need sieving to remove fibres after puréeing the mixture – this is particularly important if using runner beans. Serve sprinkled with finely chopped fresh fennel leaves (from the bulb) or dill.

Plus points

Making soup is an excellent way of preserving all the water-soluble vitamins – the B group and vitamin C – which are otherwise lost when the cooking water from vegetables is discarded. * This low-fat soup is made with leeks instead of the usual onion. Leeks are a useful source of several water-soluble vitamins, including vitamin C and folate.

Each serving provides

Excellent source of vitamin A, vitamin E. Good source of vitamin C. Useful source of folate, potassium, vitamin B1, vitamin B6.