Mustard Sauce - cooking recipe

Ingredients

1/2 c. Coleman's dry mustard
1/2 c. white vinegar
1 egg yolk, beaten
1/3 c. sugar
1 c. mayonnaise

Preparation

Mix dry mustard and vinegar and let stand for 1 hour.
Add beaten egg yolk and sugar.
Cook over medium heat in saucepan until thick, stirring constantly.
Cool and add mayonnaise.
This will keep refrigerated for a long time.