"This is the creamiest, richest potato salad you will ever try. The secret is in the homemade dressing. I get nothing but raves every time I make this."
1Place the potatoes into a large pot, and fill with enough water to cover. Bring to a boil, and cook for about 20 minutes, or until easily pierced with a fork. Drain. Cool, peel and dice. Transfer to a large bowl, and toss with the onion, celery, 1 teaspoon of salt, and hard-cooked eggs.
2While the potatoes are cooking, whisk together 2 eggs, sugar, cornstarch, and salt in a saucepan. Stir in the vinegar, milk, and mustard. Cook over medium heat, stirring frequently, until thickened, about 10 minutes. Remove from heat, and stir in the butter. Refrigerate until cool, then stir in the mayonnaise.
3Stir the dressing into the bowl of potato salad gently until evenly coated. Chill several hours or overnight before serving for best flavor.
Footnotes
Hard-cooked eggs
Place eggs in a saucepan and cover with cold water. Bring water to a boil and immediately remove from heat. Cover and let eggs stand in hot water for 10 to 12 minutes. Remove from hot water, cool, and peel.