Potato Salad Dressing - cooking recipe

Ingredients

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)

Preparation

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.