Pilsner: how a bad batch in Plzeň produced the world's first golden lager

Much of the lager drunk in the world today descends from one batch brewed in a western Bohemian town in the autumn of 1842. Before it, beer was mostly dark, brown or cloudy, and often sour or inconsistent. After it, a clear golden beer under a firm white head was something people could recognise and ask for by name, which is why "pilsner" sits on supermarket shelves from Brazil to Japan.

The story is usually told as the tale of one brewer. It fits better as a collision of three things: a town with a quality problem, a fermentation method spreading from Bavaria, and a change in how malt could be dried.

A town with a quality problem

Plzeň was founded in 1295 by order of Wenceslas II of Bohemia, and in the Middle Ages its citizens held rights to brew beer in their own houses. By the early nineteenth century, many of these house-breweries were producing uneven beer. The standard account, repeated in the town's own history, is that in 1838 the council had 36 barrels of spoiled beer poured out in public. The exact number belongs to local tradition and historians handle the story with caution, but the underlying fact is not in doubt: Plzeň brewing had a reputation problem.

The citizens' answer was institutional. In 1839 a group of burghers, who held the legal right to brew, founded a new joint brewery, the Měšťanský pivovar (Burghers' Brewery), on the edge of the old town. They wanted a modern plant, and they wanted a brewer who knew bottom fermentation.

The Bavarian and the yeast

Bottom fermentation was the method used in Bavaria. The yeast works at cool temperatures and settles at the bottom of the vessel, and the beer is then stored cold for weeks or months, a process known as lagering (from the German lagern, to store). The result is a clean, stable beer. Top-fermented ale, the older method, ferments warmer and faster and gives a fruitier, less predictable product.

The burghers hired a Bavarian brewer, Josef Groll, who was born in 1813 and was in his late twenties when he arrived. The first brew was on 5 October 1842, and the brewery's own history dates the first public tapping to 11 November 1842 (check the brewery's published history). The beer was drunk in town that autumn and soon began to travel.

Why it was golden

The colour needs a separate explanation, because yeast alone does not make a beer pale. Three things combined.

The first was malt. In the early nineteenth century British maltsters moved towards indirect kiln heating, using coke, which dried barley without smoking or scorching it. The result was paler, more consistent malt. Brewers in Bavaria and Bohemia adopted the technique, and the pale malt in Plzeň's beer reflects it. Before this, much malt was dried over open fires and came out dark.

The second was water. Plzeň's water is very soft, with little dissolved calcium and magnesium. Soft water suits pale, hop-forward lager because the hops give a clean bitterness without harshness, and brewers elsewhere later learned to adjust their water to imitate it.

The third was glass. Opaque tankards had hidden the colour of beer. By the mid-nineteenth century clear drinking glass was getting cheaper, and a pale, clear beer looked superb in it. A modest point, but looks helped the beer spread.

Then the hops. Saaz hops come from the Žatec area in north-western Bohemia and are known for a mild, spicy, floral bitterness. Žatecký chmel is a protected designation of origin (PDO) in the EU (as of 2026; check the EU's eAmbrosia register). In 2023 UNESCO added "Žatec and the Landscape of Saaz Hops" to the World Heritage List.

From local product to global style

The beer sold well early on, and as railways spread through the century it could travel far beyond Bohemia. "Plzeň" is "Pilsen" in German, so the beer became "Pilsner" or "Pilsener" in German-speaking markets. Other brewers began to make "Pilsner-style" beers, and the term lost its link to a place.

That left a dispute with a legal echo. The brewery's brand for the original is Plzeňský Prazdroj, roughly "Pilsen source", and in English Pilsner Urquell, "Urquell" being German for "original source". The EU protects the geographical indication České pivo (Czech beer) as a PGI (as of 2026; check eAmbrosia). "Pilsner" itself remains a style word anyone may use.

The brewery has changed hands more than once. It now belongs to the Japanese group Asahi, whose purchase of the former SABMiller businesses in central and eastern Europe from AB InBev was announced in 2016 and completed in 2017 (check the company's own history).

What a Czech pilsner tastes like

A Czech pilsner differs from a generic international lager in its balance: golden to deep gold, a firm white head, a malt body with a bready or biscuit note, and a Saaz bitterness that is noticeable but not aggressive. German pilsners tend to be paler and drier, with a sharper hop character. Related, but not the same.

Traditional Czech brewing takes time. Lagers were historically matured for weeks in cold cellars, and the underground cellars beneath the Plzeň brewery are a visitor attraction. Many modern producers shorten the process, so the result depends on the producer, not the label.

Pilsner and Czech identity

For Czechs the beer is more than a drink. It is industrial heritage, from one of the first big modern plants in the Czech lands.

In daily life it is the baseline: plenty of pubs tell you which beer they pour before they tell you what is for dinner. How that works at the table is in our guide to Czech beer culture, and what goes with it in Czech traditional food. Its local rival in the glass is covered in Czech wine.

Frequently asked questions

Who invented Pilsner?

The Bavarian brewer Josef Groll brewed the first batch at the Burghers' Brewery in Plzeň in 1842. The result came from a combination of bottom fermentation, pale malt, soft water and Saaz hops.

Is 'pilsner' a protected name?

No. It is a generic style term. The brand Pilsner Urquell (Plzeňský Prazdroj) and the geographical indication České pivo are protected separately (as of 2026; check eAmbrosia).

Where do Saaz hops come from?

From the Žatec area in north-western Bohemia. The Žatec hop landscape was added to the UNESCO World Heritage List in 2023.

Can I visit the brewery?

Yes, there are guided tours in Plzeň. Check the official site for current times and booking.