PLACE all the ingredients, except the oil, in a large saucepan and bring to the boil. COVER the pot, reduce the heat to medium, and simmer for 15 minutes. TRANSFER the soup to a blender and process until smooth, then return to the saucepan. STIR in the olive oil and heat thoroughly before serving.
Serving idea: You can also chill this soup and serve it cold as a light summer meal with bread.
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