Tart of Darkness
From the Brewery:
"Tart of Darkness is a traditional stout that we aged in used oak barrels from The Bruery that has previously housed beers such as Cuivre or Black Tuesday. We then brought them over to Bruery Terreux, added our special blend of souring bacterias and wild yeasts and watched nature take its course. The result is a perfectly tart yet awesomely dark and roasty, sour stout. Not a style you will see very often, and in our opinion, not a style seen often enough."