Potato salad with beer dressing

Ingredients:

6 medium potatoes
4 bacon slices
1 Tablespoon onion, chopped
1 celery stalk, chopped
1 teaspoon salt
2 Tablespoons butter
2 Tablespoons unbleached flour
1/2 teaspoon dry mustard
1 Tablespoon sugar
1 cup beer, any brand
1/2 teaspoon Tabasco hot pepper sauce
2 Tablespoons fresh parsley, chopped

Preparation:

Boil potatoes in medium-size saucepan until just tender. Peel and slice.
Fry bacon until crisp. Break into small pieces and mix with onion, celery and salt. Set aside.
Stir melted butter and flour in a small saucepan until blended.
Add mustard and sugar.
Slowly stir in beer and hot pepper sauce.
Bring to a boil, stirring constantly.
Pour over potatoes.
Sprinkle with parsley.
Toss lightly and let stand 1 hour.
Add bacon mixture.
Toss gently and serve.