Arizona-Champagne Payne Mustard
["1/2 c. dry mustard", "1/2 c. cider vinegar", "1 egg, beaten", "1/2 c. sugar", "dash of salt", "1 tsp. cornstarch", "1 c. mayonnaise"]
["Mix mustard and vinegar; let stand in refrigerator overnight. The next day, bring to room temperature; put into a saucepan.", "Add egg, sugar, salt and cornstarch; cook slowly, stirring until it boils and thickens.", "Cool and add mayonnaise.", "Stir well and refrigerate."]
["dry mustard", "cider vinegar", "egg", "sugar", "salt", "cornstarch", "mayonnaise"]