Patio Potato Salad
["1/2 c. milk", "1/3 c. sugar", "1/4 c. vinegar", "1 egg, slightly beaten", "4 Tbsp. butter", "1 Tbsp. cornstarch", "3/4 tsp. salt", "1/4 tsp. dry mustard", "3/4 tsp. celery seed", "1/4 c. chopped onion", "1/4 c. mayonnaise", "6 c. cooked, diced potatoes", "3 hard cooked eggs, chopped"]
["Cook and stir first nine ingredients over low heat until thickened.", "Remove from stove and blend in onion and mayonnaise. Cool."]
["milk", "sugar", "vinegar", "egg", "butter", "cornstarch", "salt", "dry mustard", "celery seed", "onion", "mayonnaise", "potatoes", "eggs"]