Mayonnaise Dressing - cooking recipe

Ingredients

3/4 c. sugar
2 Tbsp. flour
1 tsp. salt
1 tsp. dry mustard
1 egg
1/2 c. vinegar
1 heaping Tbsp. butter

Preparation

Combine sugar, flour, salt and dry mustard.
Add egg and beat together.
Then take 1/2 cup vinegar and finish filling the cup with water.
Beat until smooth.
Add butter and cook in a double boiler.