“What’s the difference between a lager and a pilsner?” That is a question I am often asked by people eager to learn more about beer.
The answer: There is none; pilsner is a style of lager. It’s fair to say that all pilsners are lagers, but not all lagers are pilsners.
Along with ale, lager is a broad category of beer that encompasses numerous styles. Pilsner, American lager, Oktoberfest and bock are some of the many types of lager. What sets lagers apart from ales is fermentation.
The yeast used to ferment lagers, Saccharomyces pastorianus, is a different species from those used for ales. It works more slowly and at lower temperatures than its counterpart and typically requires a long period of cold aging to complete the process. Lager yeasts are also able to ferment certain sugar molecules that ale yeast cannot.
The process of fermentation from sugar to alcohol is complex and requires many steps. At each stage, yeast produces chemical byproducts that give beer fruity and spicy flavor and aroma. Ale yeast’s higher fermentation temperature promotes the production of these compounds. The colder fermentation of lagers inhibits the production, resulting in beers with a clean profile. The consumption of extra sugars leaves lagers crisp and dry.
Beyond these differences, the full range of malt, hops and other brewing ingredients is available to both ale and lager brewers. Like ales, lagers can be pale to dark, light to creamy rich and malty sweet to bitter. Wherever they land, they always have a recognizable clean, crisp and dry character that sets them apart.
You can’t talk about lagers without discussing Czech pilsner. It’s certainly not the first lager, but it is the one that changed the world. Every pale lager on the planet is descended from the first pilsner, Pilsner Urquell.
There are many good examples of Czech-style pilsner brewed locally. Steel Toe Brewing’s Czech-Style Pils (St. Louis Park) is a good one. It’s everything a Czech pilsner should be: sharp, crisp and dry with an ample bready malt base and prominent perfume/spice hop flavor. Bitterness is high but still allows for a bit of malt sweetness. The medium-full body is substantial, but it still goes out light and dry with lingering floral hops.