Lulu'S Potato Salad Dressing
["4 egg yolks", "1 c. sugar", "1 Tbsp. dry mustard", "1 1/2 c. milk", "1/2 tsp. salt", "4 Tbsp. flour", "1 1/2 c. vinegar"]
["Sift dry ingredients.", "Add eggs, milk and vinegar slowly.", "Stir constantly while cooking until mixture thickens."]
["egg yolks", "sugar", "mustard", "milk", "salt", "flour", "vinegar"]