2 tbsp. Coleman's dry mustard
1/2 c. vinegar
1/2 c. sugar
Pinch of salt

Mix and add:

2 well beaten eggs
1 tbsp. flour
1/2 c. half and half
1 tbsp. butter

Cook on low heat. When begins to thicken, add butter. Cool and keep refrigerated. (If too thick, thin with a little milk or half and half to desired consistency.)