Potato Soup - cooking recipe

Ingredients

3 potatoes
1 qt. milk
2 slices onion
3 Tbsp. butter
2 Tbsp. flour
1 1/2 tsp. salt
1/4 tsp. celery salt
1/8 tsp. pepper
few grains cayenne
1 tsp. chopped parsley

Preparation

Cook potatoes in boiling salted water.
When soft, rub through strainer or use 2 1/2 cups mashed potatoes.
Scald milk with onion.
Remove onion and add milk slowly to potatoes, using a whisk.
Melt half the butter; add dry ingredients.
Stir until well mixed, then stir into hot soup.
Boil 1 minute.
Strain.
Add remaining butter and sprinkle with parsley.