Cooked Salad Dressing(Potato Salad) - cooking recipe

Ingredients

1 tsp. dry mustard
1/4 tsp. celery seed
2 Tbsp. flour
1 egg
1/3 c. vinegar
1 tsp. salt
pepper to taste
2 Tbsp. sugar
1 1/4 c. milk
2 Tbsp. butter

Preparation

Mix dry ingredients together in top of double boiler. Beat egg with milk; slowly add to dry ingredients, blending thoroughly. Cook over hot water until it begins to thicken, about 5 to 8 minutes, stirring constantly. Add vinegar and butter; continue cooking until thickened, about 3 to 4 minutes. Remove from heat and beat with rotary beater until smooth. Chill. Makes about 1 3/4 cups.