Cooked Salad Dressing - cooking recipe

Ingredients

3 Tbsp. vinegar
1 egg
1/3 c. milk
1 Tbsp. oil
1/2 tsp. salt
1/2 tsp. sugar
1/2 tsp. dry mustard or prepared

Preparation

Add vinegar to egg and beat.
Stir in rest of ingredients. Cook in double boiler or over water; stir constantly until it thickens.