Vienna bread

Vienna breadis a type ofbreadthat is produced from a process developed inVienna,Austria, in the 19th century. The Vienna process used highmillingofHungariangrain, and cereal press-yeast forleavening.
In the 19th century, for the first time, bread was made only frombeeryeastand new dough rather than asourdoughstarter. The first known example of this was the sweet-fermented Imperial "Kaiser-Semmel" roll of the Vienna bakery at theParis International Exposition of 1867.These sweet-fermented rolls lacked the acid sourness typical ofLactobacillus, and were said to be popular and in high demand.
Prior to this time, bakers had been using old-dough leavens, and they had discovered that increasing the starter's rest intervals betweenrefreshmentpromoted more yeast growth and less gas production due to overwhelmingLactobacillusnumbers. At some point bakers began to add brewer's yeast, or beer yeast orbarm, to the refreshments which produced a whiter, sweeter-tasting bread.
A shortage of beer yeast for making sweet-fermented breads developed when beer brewers slowly switched fromtop-fermentingto bottom-fermenting yeast (Saccharomyces pastorianus), and thus the Vienna Process was developed by 1846.In 1845 the Association of Vienna Bakers announced a contest for the production of a sweet-fermenting yeast and the prize was awarded in 1850 toAdolf Ignaz Mautner of Markhof[de]. The Paris Exposition credited the Vienna Bakery in 1867 as the first in the world to use press-yeast.
Three types of bakes were exhibited by the Viennese bakery at the exposition: the sweet-fermented Imperial rolls, wheat and rye or solely rye loaves, and a large variety of fancy breads and sweet cakes. The Imperial rolls were made with the finer grades of flour, milk and water in a 50:50 ratio, beer yeast, and salt. Other breads made with the same grades of flour includedteacakes, which added butter and may have excluded water in favor of milk; Gipfel or Pinnacle cake, which used milk (no water) and lard andbrioche, made with milk and sugar.
Vienna yeast was propagated utilizing amashofmaltedcorn,barley, andrye. After pitching a small amount of yeast into the cooledwort, and introducing some air,the propagated yeast floated to the surface. This yeast was collected with some care by skimming.  Cool, distilled water was used to wash and settle the yeast a sufficient number of times until only the yeast remained. It was then drained and compressed with the aid of a hydraulic press.
Press-yeast was one forerunner to the modern, commercially availablebaker's yeast.
Hungarian high milling used a hard or tenacious variety of Hungarian wheat. Their mills were outfitted with both stone and steel-roller mills, and were using a new process that was undoubtedly at the forefront of the technology of the day. This time period marked a changeover from one-pass stone grinding orlow millingwith its higher damaged starch content, to that of roller milling with greater speed, efficiency, and cooler-temperature operation.
Agricultural chemistEben Norton Horsfordwrote,
Horsford observed that high-milled flour contained less damaged starch,
The origins of high milling appeared to be Austria. Horsford attributed the phrasehigh millingtoVienna grits,which were on sale in Berlin as early as 1810.The recognized pioneer was a miller named Ignaz Paur (1778–1842) who by 1810 had moved to Leobersdorf. The demand for these grits was so great, hand sifting them was inadequate, so Paur employed the services of a cabinet maker named Winter to build the firstmiddlings purifier. Paur milled already-separated grits a second time, first making anextract flourlocally known asAuszug. Over the course of several decades, these high-milling techniques spread to Hungary, Saxony, and Bohemia, among other areas. In Hungary, the steel cylinder or roller mill, locally known as theWalzenmühle, was first invented, and later improved. The Walz sets kept the grain cooler over multiple passes, as successive pairs of rollers were adjusted to incrementally smaller spacings, the grain moved through cooling air from one pair to the next, each cracked them pass-by-pass into smaller successive bits, instead of crushed between stones in one heat-generating pass.
At the Pesth Walzenmühle, when wheat had been fully transformed to flour, it had passed through 18 to 24 pairs of rollers. This newcold millingprocess, particularly well suited for hard wheat, likely resulted in lighter, more airy breads of greater baked volumes.
The Vienna bread-production process innovations are often credited for baking with steam leading to different crust characteristics.In 1837,August Zang, a native of Austria, opened a Bakery in Paris called the "Boulangerie Viennoise" which first introduced steam baking to France,and whose process was described in detail in an entry on Viennese Bread in an 1849 French Industrial Chemistry book: "the crust of these breads glazes while baking in an atmosphere of steam, to which effect, one places on the floor of the oven a pile of wet hay, well washed in advance, which produces a cloud of steam".Decades later, another Viennese bakery in Paris introduced the mechanical steam oven, eliminating the need for wet hay, along with cereal press yeast; the United States government report on the1867 Universal Expositiondetails the process used in the "Viennese bakery of Mr. Vanner", including his use of a steam oven, which by then had become quite popular in France:
In the steam oven technique,  dough is placed into theovenunder a ceiling of steam or, alternatively, the oven is injected with steam as soon as the loaf is loaded.  This adds moisture to the body of the bread which delays establishment of the crust and tends to prevent cracking, resulting in a more evenly risen and thinner crust as well as a light and airy crumb.When the steam is turned off, the dry heat of the oven bakes the crust, producing its characteristically slightly crisp and flaky texture.  Vienna bread is typically formed as an oblong loaf, but can be baked in other shapes.  As a longer loaf, it may well have been the origin of French bread as bakers there attempted to adopt the steam method to produce theirbaguettes.
Some reports in the decades to follow point out that not all Viennese bread is produced in a steam oven. For instance,  Horsford, in his 1875Report on Vienna Bread, wrote: