Mother'S Salad Dressing - cooking recipe

Ingredients

3/4 c. vinegar
1 tsp. dry mustard
2 Tbsp. flour
3 Tbsp. sugar
1 tsp. salt
1/2 Tbsp. margarine

Preparation

Mix sugar, mustard, salt and flour in top of double boiler. Add vinegar (weak).
When nearly cooked, add margarine.
Cook until consistency of heavy cream.