method
1. Melt the butter in a medium saucepan, then fry the mushrooms for 2 minutes.
2. Stir in the flour and milk. Heat, stirring continuously until the sauce thickens, boils and is smooth. Simmer for 1-2 minutes.
3. Stir in the mustard, tarragon and soured cream. 4. Serve hot on a nest of chicory and lettuce leaves, garnished with fresh tarragon.
serving amount
serves 4
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