This green version of classic vichyssoise is enriched with yoghurt rather than cream. Traditionally served chilled, the soup can also be served hot, so it is ideal for days when the weather is changeable.
Chilled cucumber soup: Replace the sugar snap peas and asparagus with 1 cucumber, chopped, and the chives or chervil with 1 tbsp very finely chopped fresh mint. Cucumber contains a lot of water, so use only 600ml of stock. Garnish with shreds of fresh mint.
*The soup freezes well, but do not add the yogurt before freezing: stir in the yogurt when the soup is thawed but still chilled, then season, garnish and serve.
Asparagus is an excellent source of folate as well as providing vitamins C and E and betacarotene. Asparagus has a mild laxative effect.