Mustard Sauce
["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"]
["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."]
["egg yolks", "Campbell's tomato soup", "salad mustard", "sugar", "cider vinegar", "margarine"]