Fish Filets Poached in White Wine with Mushrooms
Bercy is the simplest of the white-wine fish sauces. The poaching liquid is thickened with beurre manié—a flour and butter paste—then enriched with cream. This combination of fish, mushrooms, and cream sauce is an informal version of sole bonne femme. Serve with it a white Burgundy, Graves, or Traminer.