Dot's Salad Dressing

2 Tbsp. flour
1 Tbsp. sugar
1/2 tsp. salt
scant tsp. dry mustard
1 Tbsp. butter
1 egg
1 cup milk
1/2 cup vinegar

Mix flour, sugar, salt, and mustard. Add butter and egg, mix to a paste. Add milk and vinegar and stir while cooking about 5 minutes after is comes to simmering. Beat well after it is cooked.