Method
1. Preheat large saucepan. 2. Heat olive oil. 3. Add onion and leeks and fry until soft. 5. Pour in stock. Bring to the boil then simmer for 10-12 minutes. 6. Add the stilton and stir until melted. 7. Place soup in food processor and blitz until smooth. 8. Ladle in two soup bowls and top with chervil.
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