It is the duty of every housekeeper to learn the art of soup making. How may a hearty dinner be better begun than with a thin soup? The hot liquid, taken into an empty stomach, is easily assimilated, acts as a stimulant rather than a nutrient (as is the popular opinion), and prepares the way for the meal which is to follow. The cream soups and purees are so nutritious that, with bread and butter, they furnish a satisfactory meal.
Long soaking in cold water, draws out the juices of meat and dissolves the gelatine. Soup stocks are prepared in this manner and then cooked at a low temperature. Celery leaves can be tied in a bunch and hung in a sunny place to dry, then placed in a paper bag, ready for use. The stalks and roots can be dried in a slow oven, powdered and bottled. Celery seed can be used for soups when the celery root or stalks are not at hand.
Slice four ordinary-sized potatoes into one quart of boiling water. When done add one quart milk; into this slice one onion. Thicken just before serving with one egg rubbed into as much flour as it will moisten. Pepper and salt to taste.
After stewing veal, use the stock. Slice four or five potatoes very thin; lay them in cold water until thirty minutes before serving; add them to the stock, with sufficient salt and pepper. Beat one tablespoon of butter and one tablespoon of flour to cream; add to this one pint milk; stir in the soup just before serving. This can be made without meat by adding more butter and milk.