method
1. Put the leek, onion, celery and garlic into a large saucepan over a high heat and cook, stirring constantly, for 5 minutes, or until softened but not coloured. You will not need any oil as the steam and the continuous stirring will prevent the vegetables from sticking.
2. Add the bay leaves, mushrooms, potato, beans, stock and tarragon, stir well and bring to the boil. Reduce the heat, cover and simmer for 20 minutes, or until the vegetables are mushy.
3. Meanwhile, for the garnish, mix the lemon juice, sugar and pepper together in a separate saucepan. Add the diced mushroom, cover and cook over a high heat for 4 - 5 minutes. Remove from the heat and leave to cool in the pan.
4. Remove the bay leaves from the soup and discard. Using a hand-held electric blender, blend the soup until smooth, or use a food processor. Stir in the milk. Pass through a medium sieve into a serving dish.
5. To serve, pour the mushroom garnish into the soup, sprinkle over a little tarragon and add a swirl of fromage frais.
serving amount
serves 4
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