5 medium potatoes, boiled with skins on
½ cup chopped celery
½ onion, chopped
3 boiled eggs, diced
½ cup pickle relish (or more if desired)
Dressing:
1 egg, well-beaten
1 tablespoon sugar
1 tablespoon ground mustard
½ cup boiling water
½ cup vinegar
Pepper to taste
1 small lump of butter
½ cup sour cream

Peel and cube potatoes into a large bowl. Add celery, onion, eggs and relish. Set aside.
In a saucepan combine egg, sugar, mustard, water, vinegar, pepper and butter. Bring mixture to a boil; remove from heat. Stir in sour cream. Pour over potato mixture. Serve warm immediately or refrigerate to serve cold.