Bercy Sauce I is a classic French sauce that is often served with fish and seafood dishes. It is a flavorful and aromatic sauce made with white wine, shallots, and fish stock. The sauce is simmered until it reduces and thickens, creating a rich and savory flavor. It pairs well with a variety of seafood, such as grilled fish or seared scallops, adding a touch of elegance to the dish.