Creamy Mustard Sauce - cooking recipe

Ingredients

1 egg
1 Tbsp. dry mustard
1 1/2 tsp. each sugar and butter or margarine
1/4 tsp. salt
2 Tbsp. vinegar
1/2 c. mayonnaise
1/2 c. whipping cream, whipped
1 Tbsp. chopped parsley or chives

Preparation

In top part of double boiler, beat egg, mustard, sugar, butter, salt and vinegar. Set over simmering water. Cook for 2 to 3 minutes, beating with whisk until mixture thickens. Remove from heat and cool to room temperature.
Beat in mayonnaise. Fold in whipped cream. Cover and refrigerate until needed. Sprinkle with parsley or chives before serving.