Potato Salad Dressing - cooking recipe

Ingredients

1/2 c. milk
1/3 c. sugar
1/4 c. vinegar
1 egg
4 Tbsp. butter
1 Tbsp. cornstarch
3/4 tsp. salt
3/4 tsp. celery seed

Preparation

Cook and stir over medium heat until thickened.
Cool.
Blend in 1/4 cup mayonnaise or salad dressing.
Add prepared mustard to taste.