Sautee the apples with butter until caramelized and put them aside. Season the fish on both sides and sauté them in the oil. In a saucepan, reduce the Calvados wine, the white wine, and the shallots to half and then add the heavy cream. Reduce the sauce to a creamy consistency. Add seasoning. Drain the sauce.
To serve: Pour the sauce onto the dish. Add the fish and top with the apple mixture.