Potato Soup
3 potatoes
1 quart milk
2 slices onion
3 tablespoons butter
2 tablespoons flour
1½ teaspoons salt
¼ teaspoon celery salt
⅛ teaspoon pepper
Few grains cayenne
1 teaspoon chopped parsley
Cook potatoes in boiling salted water; when soft, rub through a strainer. Scald milk with onion, remove onion, and add milk slowly to potatoes. Melt half the butter, add dry ingredients, stir until well mixed, then stir into boiling soup; cook one minute, strain, add remaining butter, and sprinkle with parsley.