Part of BrewDog Collab Fest. The biggest collaborative beer festival the world has ever seen. On October 19th 2013 all BrewDog bars will be tapping 12 new never-before-seen beers. All 12 of these beers are the result of our awesome bar teams buddying up with one of their local breweries. Dark Matter was brewed by BrewDog Shoreditch & Beavertown Brewery. After formulating a massive, eclectic list of suggestions from the staff, including a Spiced Salt Beef Bagel Beer (?), our Shoreditch crew headed to Beavertown to discuss the beer with them. With sour beers having a massive effect on the UK craft beer scene this year, they opted for something that was ‘on-trend’ but also unpredictable: a Berliner Sour Stout. The brew was very different to anything Beavertown had done before and was a real challenge - it ended up taking 3 days to go from the mash to fermenter.