Macaroni Salad - cooking recipe

Ingredients

1 c. macaroni, cooked
1 grated carrot
1 small chopped onion
celery and parsley (optional)
3 Tbsp. sugar
1 tsp. salt
1 1/2 Tbsp. flour
1 tsp. mustard
1 egg, beaten
3/4 c. milk
4 Tbsp. vinegar
1 Tbsp. butter

Preparation

In making sauce, cook sugar, salt, flour, beaten egg, milk, mustard and vinegar over hot water in double boiler, stirring constantly, until thick.
Add 1 tablespoon butter.
Blend thoroughly and cool.