Barm is the foam or scum formed on the top of a fermenting liquid, such as beer, wine, or feedstock for spirits or industrial ethanol distillation. It was used to leaven bread, or set up fermentation in a new batch of liquor. Barm, as a leaven, has also been made from ground millet combined with must out of wine-tubs and is sometimes used in English baking as a synonym for a natural leaven. Various cultures derived from barm, usually Saccharomyces cerevisiae, became ancestral to most forms of brewer's yeast and baker's yeast currently on the market.
In parts of North West England and Yorkshire, a barm or barm cake is a common term for a soft, floury bread roll. Chip shops offer chip barms consisting of chips in a bread roll. They are also known as "chip butties" in some areas. Other areas describe such a roll as a "bap", "bread bun", "bread cake", "batch", or "blaa". These names are also used for yeast-leavened bread and do not imply the use of barm leaven.
In Ireland, barm is used in the traditional production of barmbrack, a fruited bread.
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- Chisholm, Hugh, ed. (1911). Encyclopædia Britannica. 3 (11th ed.). Cambridge University Press. p. 407. .
- Botham's of Whitby. "The story behind a loaf of bread".
- Reinhart, Peter (1998). Crust and Crumb. Berkeley, CA: Ten Speed Press. ISBN 1-58008-802-3. Reinhart derived the term from his training under Monica Spiller.
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