Mustard Sauce - cooking recipe

Ingredients

4 oz. dry mustard
1 c. cider vinegar
1 egg
1 c. sugar
2 c. mayonnaise
1 dash salt

Preparation

Mix mustard and vinegar until smooth and then let stand overnight.
Mix egg, sugar and salt.
Blend with mustard mixture. Cook over low heat, stirring constantly, until mixture starts to thicken (about 20 minutes).
The longer you cook it the thicker it becomes.
Cool completely after mixture has reached desired thickness, then blend with mayonnaise.