1/2 tsp. mustard
1/2 tsp. salt
1 tbsp. flour
1/4 tsp. paprika
1 egg
1/2 c. milk or water
1/4 c. vinegar
1 1/2 tbsp. butter

Mix mustard, salt, sugar, flour and paprika together. Add beaten egg and mix well. Scald milk in top of double boiler, add egg mixture, slowly. Cook, stirring constantly until mixture begins to thicken. Add vinegar slowly and continue to cook while stirring, until thick. Add butter and stir until melted. If dressing is not perfectly smooth, remove from fire and beat. This dressing is fine thinned with sour or sweet cream.