Mustard sauce recipe please,

chrisynz, Oct 15, 10:19pm
cannot find my recipe

petal1955, Jun 2, 3:45am
Mustard Sauce Edmonds Cookbook

1/4 cup sugar, 1 egg, 1 tablespoon of flour,
1 teaspoon dry mustard powder, pepper and salt to taste,
1 cup liquor corned beef is cooked in, 1/2 cup vinegar.
Beat egg and sugar, add flour, mustard, pepper and salt, then
stir in the liquid gradually. Cook until mixture thickens.