First things first though, the beer. Tanker’s flagship beer is Sauna Session. We first tried this beer when they came to London in 2018 for a collaboration and tasting night with us in Bermondsey. We were quite taken aback by this truly unique beer. The beer uses a “tea” made from steeping Estonian birch leaves in water over night and using that for around half of the brewing liquor. All the flavour comes from this inventive method and absolutely no hops are used. The beer really stuck with us, so we thought it would be a fantastic idea to use this method to brew a kettle sour…