Potato Soup
3 potatoes
1 quart milk
1 table-spoon chopped onion
A little celery or ¹⁄₂ a tea-spoon celery salt
1 table-spoon white roux
1 table-spoon chopped parsley
Peel the potatoes. Soak them in cold water for half-an-hour. Cook them in boiling water until soft. Drain off the water. Put the potatoes through a sieve. Boil the milk with the onion and celery (or celery salt). Strain. Add to the potatoes. Stir in the white roux (see p. 12). Season. Boil for five minutes. Add the parsley.