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1. In a heavy 6- to 8-inch skillet, melt the butter over moderate heat. When the foam subsides, stir in the flour and mix together thoroughly.
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2. Pour in the milk and, stirring constantly with a whisk, cook over high heat until the sauce thickens heavily and comes to a boil.
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3. Reduce the heat to low and simmer for about 3 minutes, then beat in the cream, vinegar, prepared mustard, dry mustard, salt and a few grindings of pepper.
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4. Taste for seasoning and serve at once.
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5. Mustard sauce may be served with a variety of fish dishes including Finnan haddie.
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