2 Tbsp. butter
2 Tbsp. flour
1 cup milk
¼ cup heavy cream
1 Tbsp. white vinegar
1 Tbsp. dry mustard
2 Tbsp. Dijon mustard or coarse grain mustard
1 ½ tsp. salt
½ tsp. white pepper
1. In a pan melt the butter over moderate heat. Stir in the flour and mix together thoroughly.
2. Pour in the milk and stirring constantly with a whisk, cook over medium heat until sauce thickens and comes to a simmer.
3. Reduce heat and simmer for 3 minutes, then whisk in the cream, mustards, vinegar, salt, and a few grindings of pepper. Taste for strength of mustard flavor, you may want to add a bit more and sweetness, you may want to add a pinch of sugar.
Makes just under 2 cups of sauc