Name: To Purify Yeast for Bread or Cakes
Ingredients: large quantity of cold water; small portion of brown sugar

To Purify Yeast for Bread or Cakes

Ingredients

large quantity of cold water
small portion of brown sugar

Directions

Mix the yeast with a large quantity of cold water.
Let it sit overnight in a cool place.
Drain off the water and stir the yeast with fresh water.
Let it stand for several hours until the water can be poured clear from it.
Change the water daily in winter and twice daily in hot weather.
If the yeast ferments less freely, stir in a small portion of brown sugar before making bread.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

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To Purify Yeast for Bread or Cakes