The tang of Dijon mustard and the smoothness of whipping cream combine with the light flavor of champagne or white wine to make this a wonderful, easy sauce for fish. COMBINE THE BROTH, anchovies, shallots and mustard in a small saucepan over medium heat on the stove. Bring to a boil and cook until liquid reduces by about one third and begins to thicken. Add the cream and continue to cook until the mixture becomes saucelike and is thick enough to coat the back of a spoon. Remove from the heat and whisk in the butter. Serve immediately or keep warm in a water bath. Makes 1 Cup