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.