Mustard Sauce - cooking recipe

Ingredients

3 beaten egg yolks
1/2 can Campbell's tomato soup
1/2 c. salad mustard
1/2 c. sugar
1/2 c. cider vinegar
1/2 cube margarine

Preparation

Combine all ingredients in top of double boiler and cook until thick, stirring frequently.
Can be served either hot or cold with baked ham.
This has been a holiday \"must\" in our family since the early 1950's.
It will keep for weeks in the refrigerator.