Clabbered milk: Clabbered milk or sour milk needs no special preparation. Put the milk into an earthen or china dish. Do not use metal dishes, for the lactic acid acts upon various metals. Cover the dish so as to keep particles of matter in the air away, but the covering is not to be airtight. Put the dish in a warm place, but not in the sun. Milk that sours in the sun or in an air-tight bottle is generally of poor flavor. Clabbered milk is a good food. It does not form big, tough curds in the stomach, it is easy to digest, and the lactic acid helps to keep the alimentary tract sweet. The various forms of milk may be used in similar combinations.
Buttermilk: The real buttermilk is what remains of the cream after the fat has been removed by churning. It is slightly acid and has a characteristic taste, to most people very agreeable. The flavor is different from that of artificially made buttermilk. In composition it is almost like whole milk, except that it contains very little fat.
Many people make buttermilk by beating the clabbered milk thoroughly, until it becomes light. The buttermilk made from sweet milk and the various brands of bacterial ferments obtainable at the drug stores is all right. These ferments have as their basis the lactic acid bacteria, and if the manufacturers wish to call their germs by other names, such as Bacillus Bulgaricus, no harm is done. It is unnecessary to add any of these ferments, for the milk clabbers about as quickly without them.
Buttermilk is an excellent food. The casein can be seen in fine flakes in the real buttermilk. Adults usually digest buttermilk and clabbered milk more easily than the sweet milk. The lactic acid seems to be quite beneficial. Metchnikoff thought for a while that he had discovered how to ward off decay and old age by means of the lactic acid bacteria in milk.
Milk can be clabbered quickly by adding lemon juice to sweet milk.
Junket: Add rennet to milk and let it stand until it thickens. The milk is not to be disturbed while coagulation takes place, for agitation will cause a separation of the whey. The rennet can be bought at the drug stores.
Whey contains milk sugar, some salts, and a little albumin. It is easily digested, but not very nourishing. It is what is left of the milk after the fat and almost all of the protein are removed.
Cottage cheese: This is sometimes called Dutch cheese or white cheese. It is a delicious and nutritious dairy product that is easy to digest. Put the clabbered milk in a muslin bag, hang the bag up and allow the milk to lose its whey through drainage. In summer this bag must be kept in a cool place. After draining, beat the curds. Then add enough clabbered milk to make the curds soft when well beaten. A small amount of cream may also be added. Cottage cheese made in this way is superior in flavor and digestibility to that which has been scalded. No seasoning is needed. A little salt is allowable, but sugar and pepper should not be used. Fruit and cottage cheese make a satisfying as well as nutritious meal.
Delicious cottage cheese is also made by using the whole clabbered milk. Hang it up to drain in a bag until it has lost a part of its whey. Then beat it until the curds are rather small, but not fine. No milk or cream is to be added to this, for it contains all the fat that is in the whole milk. Do not drain this cheese so long that it becomes dry.
Other cheeses: The various cheeses on the market are made principally from ripened curds, with which more or less fat has been mixed. The ripening is a form of decay, and it is no exaggeration to say that some of the very ripe cheeses on the market are rotten. The flavors are due to ferments, molds and bacteria, which split up the proteins and the fats.