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QUALITY OF YEAST
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Of equal importance with the quality of flour is the quality of yeast used in the baking of bread. Yeast is, of course, accountable for the lightness or sponginess of bread, but, in addition, it improves the flavor of the bread if it is of good quality or detracts from the flavor if it is of poor quality. Since the condition of yeast cannot be determined until its effect on the finished product is noted, the housewife should take no chances, but should employ only yeast, whether she uses commercial or liquid, that she knows to be good and reliable.
Compressed yeast may be easily judged as to quality. It should be grayish white in color, without streaks or spots, and it should have no sour nor disagreeable odor. If home-made yeast is used and the results obtained are not satisfactory, it may be taken for granted that a fresh supply should be prepared.
YEAST AIDS
As has already been explained, yeast, in order to grow, requires something on which to feed, and the food that produces the most rapid growth is that which contains carbohydrate. Certain of the carbohydrates, however, prove to be better food and produce more rapid growth than others, and these, which are known as yeast aids, are usually added as ingredients in the making of bread. The ones that are most commonly used are sugar and potato water. Sugar is almost always added, but it should be limited in quantity, because a dough mixture that is made heavy with sugar will rise very slowly.
Potato water has been found to be a very satisfactory aid, because the starch of the potato is utilized readily by the yeast. If this aid is to be used, the water in which potatoes are boiled may be saved and, when the ingredients required for the making of bread are mixed, it may be added as a part or all of the liquid required. If it is desired to increase the amount of starch in the potato water, a boiled potato or two may be mashed and added to it.
MILK AND FAT IN BREAD
Milk is sometimes used as a part or as all of the liquid in bread. While it adds nutritive value and is thought by many persons to improve the texture, it is not absolutely essential to successful bread making. Whenever milk is used, it should first be scalded thoroughly. A point that should not be overlooked in connection with the use of milk is that the crust of milk bread browns more readily and has a more uniform color than that of bread in which water is used as liquid.
Like milk, fat adds nutritive value to bread, but it is not an essential ingredient. If it is included, care should be taken not to use too much, for an excessive amount will retard the growth of the yeast. Almost any kind of fat, such as butter, lard or other clear tasteless fats, or any mixture of these, may be used for this purpose, provided it does not impart an unpleasant flavor to the bread.
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