Grate potatoes, have ready a gallon of water in which you have boiled the hops. Strain through a fine hair sieve, boiling hot, over the potatoes, stirring well, or the mixture will thicken like starch. Add sugar and salt. When cold, add yeast. Let it stand until a thick foam rises on the top. Bottle in a few days. If kept in a cool place, this yeast will last a long time. Use one cup of yeast for one large baking. In making yeast, from time to time, use a cup of the same with which to start the new yeast.
One cup of liquid yeast is equal to one cake of compressed yeast.
When yeast is not obtainable to start the fermentation in making yeast, mix a thin batter of flour and water, and let it stand in a warm place until it is full of bubbles. This ferment has only half the strength of yeast so double the amount must be used.
The International Jewish Cook Book (1919).
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