Bohem Brewery has launched its first collaboration beer, brewed in partnership with Cornwall-based St Austell Brewery.

Otakar Brut Lager has been brewed by Roger Ryman, the head brewer at family-owned St Austell, and Petr Skocek, co-founder and head brewer of London-based Bohem Brewery, which brews authentic Bohemian-style lagers on bespoke brewing equipment from the Czech Republic.

To create the brew Ryman transported the yeast used to brew St Austell Brewery’s Korev lager to Bohem in London. The recipe, originally developed for a one-off beer called Korev Brut, was given a new twist by being brewed by Ryman and Skocek on Bohem’s special decoction brewing kit.

The result is Otakar Brut Lager, a 6.4% abv beer authentically lagered at low temperature for six weeks. The beer is named after several King Otakars who ruled Bohemia, which is today within the Czech Republic. The beer is made with Pilsner, Cara Gold, Acid Malt and maize, along with Magnum, Hersbrucker and Saaz hops, as well as Nelson Sauvin for dry hopping.

Ryman said: “Although I’ve been brewing for many years, this was the first time I’d made a decoction mash. It was very interesting to work with Petr and the team to create a unique beer which we hope lager enthusiasts will enjoy.”

Skocek said: “Britain and the Czech Republic both have great brewing traditions, and we were delighted to welcome Roger to London for his first decoction brewing experience. We hope both St Austell and Bohem beer lovers will enjoy Otakar while it’s available.

“Decoction brewing is a traditional European brewing style which sees part of the mash boiled, and returned to the main mash to raise the temperature. The process adds the depth, complexity and flavour which characterizes authentic Czech lagers.”

Otakar will be available in both keg and can through Bohem’s distribution partnership with beer wholesaler The Bottle Shop.