method
1. Melt the butter in a large saucepan, add the onion and cook, stirring, until transparent.
2. Add the potatoes, stock and seasoning.
3. Bring to the boil, then simmer until potatoes can be mashed with a fork.
4. Wash watercress and discard tough stalks and yellow leaves.
5. Reserve a few sprigs for garnish, roughly chop the rest and add to the soup. Continue cooking for 2 minutes.
6. Allow the soup to cool slightly, then blend in a liquidizer.
7. Allow to cool completely. Taste and adjust seasoning.
8. Chill and serve with reserved sprigs of watercress and a swirl of cream.
serving amount
serves 4
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