Stone Bombastic Lager is the beer left over from propagating the pilsner yeast we used in BrewDog / Cambridge / Stone Juxtaposition Black Pilsner.To feed the pilsner yeast, we added Stone Pale Ale, Stone IPA, and Stone Imperial Russian Stout wort straight from the brewhouse into the yeast propogating tank over several days. Once we were confident that there was enough growth, we pumped the yeast off the bottom (lager yeast is bottom-fermenting) and sent it over to the fermenting tank to ferment the Collaboration brew. John then transferred the leftover beer into another tank, but before transferring it he had a spark of creativity and decided to add some crushed coriander, french oak chips, and “literally a handful” of chopped vanilla beans. It sat for about a week or so, and then we gassed it up and put it in kegs. There were no additional hops or malt added; it was just a blend of a few worts. “As far as style goes, I have no idea,” said John. “It's kind of a ‘suicide’ like we did as kids with our sodas; just a mix of whatever is available. It tastes like an ale to me, but it's a lager—and a weird lager at that!” John added that the brew weighs in at 6.8% abv.