TO PURIFY YEAST FOR BREAD OR CAKES.
The yeast procured from a public brewery is often so extremely bitter that it can only be rendered fit for use by frequent washings, and after these even it should be cautiously employed. Mix it, when first brought in, with a large quantity of cold water, and set it by until the following morning in a cool place; then drain off the water, and stir the yeast up well with as much more of fresh: it must again stand several hours before the water can be poured clear from it. By changing this daily in winter, and both night and morning in very hot weather, the yeast may be preserved fit for use much longer than it would otherwise be; and should it ferment rather less freely after a time, a small portion of brown sugar and a little warm milk or other liquid, stirred to it a quarter of an hour or twenty minutes before it is required for bread-making, will restore its strength.
The German yeast, of which we have spoken in detail in another part of this chapter, makes exceedingly light bread and buns, and is never bitter; it is therefore a valuable substitute for our own beer-yeast, but cannot be procured in all parts of the country, for the reasons which we have stated.