The Stedji brewery's Hvalur 2 beer is being sold for a limited period to mark the Icelandic midwinter month of Thorri, the Visir website reports . The testicles of fin whales - which are an endangered species - are cured "according to an old, Icelandic tradition" before being salted and smoked, with one being used per brewing. "We want to create a true Thorri atmosphere, and therefore we decided to use smoked testicles from fin whales for flavouring the beer," says Dagbjartur Ariliusson, a co-owner of the brewery. "We put a lot of effort into this and it's a long process." In 2013, Iceland resumed commercial fin whaling after a two-year suspension. Most of its whale meat is exported to Japan.