Potato Salad Dressing
["4 egg yolks or 2 whole eggs", "2 Tbsp. flour", "1 tsp. mustard", "1 c. sugar", "1/2 c. strong vinegar", "1 pt. sour cream", "butter (the size of an egg)"]
["In saucepan, add flour, mustard, sugar, salt and eggs.", "Beat until smooth.", "Add cream and beat, then add vinegar, a little at a time.", "Cook over a pan of boiling water or stir constantly over medium heat until mixture thickens.", "When cool, pour over cooked, diced potatoes, onions, celery seed and boiled eggs.", "Mix thoroughly."]
["egg yolks", "flour", "mustard", "sugar", "strong vinegar", "sour cream", "butter"]