method
1. Heat the oil, add the onion and cook until it has just softened but not browned.
2. Add the vegetables and stock.
3. Stir and bring to the boil and then simmer, covered, for 20 minutes.
4. Mix the sour cream with the egg yolk.
5. Liquidize the soup, adding the sour cream mixture slowly.
6. Adjust the seasoning.
7. Serve hot or cold.
serving amount
serves 4 - 6
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