method
1. Trim the green tops from the spring onions and reserve.
2. Roughly chop the onion bulbs.
3. Heat the oil in a saucepan and add the potatoes, celery and chopped spring onion bulbs.
4. Cook, stirring, for about 1 minute, then add 600 ml (1 pint) of cold water.
5. Bring to the boil, stir and simmer, covered, for 15 - 20 minutes, until vegetables are soft.
6. Pour the soup into a blender or food processor and puree until smooth.
7. Season and leave to cool for about 4 hours.
8. Whisk the yogurt into the cooled soup and add a little water to thin the soup, if necessary.
9. Chill for 1 hour. Serve chilled, garnished with the spring onion tops and yogurt.
serving amount
serves 4
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