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Look up barm in Wiktionary, the free dictionary.
Barm, also called ale yeast, [1] is the foam or scum formed on the top of a fermenting liquid, such as beer, wine, [2] or feedstock for spirits or industrial ethanol distillation. It is 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 [3] and is sometimes used in English baking as a synonym for a natural leaven (sourdough). [4] 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.
A barm cake is a soft, round, flattish bread roll from North West England, traditionally leavened with barm. [5] [6] [7] [8] In Ireland, barm is used in the traditional production of barmbrack, a fruited bread.
Emptins, a homemade product similar to barm and usually made from hops or potatoes and the dregs of cider or ale casks, was a common leavener for those living in rural areas far from a brewery, distillery, or bakery from which they could source barm or yeast. [1]
Bread is a staple food prepared from a dough of flour and water, usually by baking. Throughout recorded history and around the world, it has been an important part of many cultures' diet. It is one of the oldest human-made foods, having been of significance since the dawn of agriculture, and plays an essential role in both religious rituals and secular culture.
Sourdough or sourdough bread is a bread made by the fermentation of dough using wild lactobacillaceae and yeast. Lactic acid from fermentation imparts a sour taste and improves keeping qualities.
Baker's yeast is the common name for the strains of yeast commonly used in baking bread and other bakery products, serving as a leavening agent which causes the bread to rise by converting the fermentable sugars present in the dough into carbon dioxide and ethanol. Baker's yeast is of the species Saccharomyces cerevisiae, and is the same species as the kind commonly used in alcoholic fermentation, which is called brewer's yeast or the deactivated form nutritional yeast. Baker's yeast is also a single-cell microorganism found on and around the human body.
In cooking, a leavening agent or raising agent, also called a leaven or leavener, is any one of a number of substances used in doughs and batters that cause a foaming action that lightens and softens the mixture. An alternative or supplement to leavening agents is mechanical action by which air is incorporated. Leavening agents can be biological or synthetic chemical compounds. The gas produced is often carbon dioxide, or occasionally hydrogen.
Dough is a thick, malleable, sometimes elastic paste made from grains or from leguminous or chestnut crops. Dough is typically made by mixing flour with a small amount of water or other liquid and sometimes includes yeast or other leavening agents, as well as ingredients such as fats or flavorings.
A bread making machine or breadmaker is a home appliance for baking bread. It consists of a bread pan, at the bottom of which are one or more built-in paddles, mounted in the center of a small special-purpose oven. The machine is usually controlled by a built-in computer using settings input via a control panel. Most bread machines have different cycles for different kinds of dough—including white bread, whole grain, European-style, and dough-only. Many also have a timer to allow the bread machine to function without operator input, and some high-end models allow the user to program a custom cycle.
Quick bread is any bread leavened with a chemical leavening agent rather than a biological one like yeast or sourdough starter. An advantage of quick breads is their ability to be prepared quickly and reliably, without requiring the time-consuming skilled labor and the climate control needed for traditional yeast breads.
A barm cake is a soft, round, flattish bread roll from North West England, traditionally leavened with barm.
A ferment is a fermentation starter used in indirect methods of bread making. It may also be called mother dough.
Barmbrack, also often shortened to brack, is a yeast bread with added sultanas and raisins. The bread is associated with Halloween in Ireland, where an item is placed inside the bread, with the person receiving it considered to be fortunate.
Chametz are foods with leavening agents that are forbidden on the Jewish holiday of Passover. According to halakha, Jews may not own, eat or benefit from chametz during Passover. This law appears several times in the Torah; the punishment for eating chametz on Passover is the divine punishment of kareth.
In food processing, fermentation is the conversion of carbohydrates to alcohol or organic acids using microorganisms—yeasts or bacteria—under anaerobic (oxygen-free) conditions. Fermentation usually implies that the action of microorganisms is desired. The science of fermentation is known as zymology or zymurgy.
In cooking, proofing is a step in the preparation of yeast bread and other baked goods in which the dough is allowed to rest and rise a final time before baking. During this rest period, yeast ferments the dough and produces gases, thereby leavening the dough.
Vienna bread is a type of bread that is produced from a process developed in Vienna, Austria, in the 19th century. The Vienna process used high milling of Hungarian grain, and cereal press-yeast for leavening.
Desem is both a type of sourdough starter made from whole wheat flour, spelt flour or other flours and water, and the resulting bread.
Salt-rising bread is a dense white bread that is traditional in the Appalachian Mountains, leavened by naturally occurring wild bacteria rather than by yeast. Salt-rising bread is made from wheat flour; a starter consisting of either water or milk and corn, potatoes or wheat; and minor ingredients such as salt and sugar.[1] Some common ways of eating salt-rising bread include a slice with sugared coffee poured over it, a grilled cheese sandwich, and the most popular preference, buttered toast.[1]
A fermentation starter is a preparation to assist the beginning of the fermentation process in preparation of various foods and alcoholic drinks. Food groups where they are used include breads, especially sourdough bread, and cheese. A starter culture is a microbiological culture which actually performs fermentation. These starters usually consist of a cultivation medium, such as grains, seeds, or nutrient liquids that have been well colonized by the microorganisms used for the fermentation.
The sponge and dough method is a two-step bread making process: in the first step a sponge is made and allowed to ferment for a period of time, and in the second step the sponge is added to the final dough's ingredients, creating the total formula. In this usage, synonyms for sponge are yeast starter or yeast pre-ferment. In French baking the sponge and dough method is known as levain-levure. The method is reminiscent of the sourdough or levain methods; however, the sponge is made from all fresh ingredients prior to being used in the final dough.
Parāoa rēwena is a type of sourdough bread from New Zealand. The bread is leavened with a fermented potato starter that is commonly known as a bug. It originated amongst the Māori people and is closely associated with Māori cuisine. The bread is also known as Rēwena bread or Māori bread.
...the original method of making yeast bread in Britain was a by-product of ale-making. When traditional ale is made, a yeasty froth appears on top of the fermenting liquid, the wort. This used to be scooped off, washed and added to bread dough in order to leaven it. Bread made this way is sweeter tasting than sourdough, and the leavening yeast used to be called 'barm'. Its unpredictability created the word 'barmy'. In the 19th century, the process was refined and industrialized, manufacturing it on a large scale with what is known today as 'baker's yeast', and used worldwide as the primary method of leavening bread. The barm method appears to be an ancient method developed by Gaelic peoples, and was quite different from that used in Europe, which is to leaven bread with a sourdough or leaven (the French call a similar product 'levain'). When the Romans first conquered Gaul, modern day France, they were astonished by the light sweet bread made by the Celtic inhabitants. Barm bread survived with the Celtic peoples in Britain, Scotland and Ireland, but was not common in Europe, being condemned during the Enlightenment as 'unwholesome'. In England, noblemen's bread, manchet, was always made with the barm method, whereas the commoners' bread, maslin, was a sourdough. Barm bread survived until World War Two, and even later in the North of England, largely as barm cakes. Curiously, the old method of making a sponge, or thick batter of flour and water with the barm was still used with the new industrially produced yeast, and was re-introduced to Europe from Vienna where the first yeast factories were established. This became popular in France as a 'poolish', the favoured method of making crusty bread such as a baguette.
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