Brewfest Pony Keg

The Brewfest Pony Keg can be used to summon a keg of Brewfest Brew on the ground which can be looted for an unlimited number of mugs of and can be shared with others.

Source
This item can be purchased for 100 Brewfest Prize Token from in Dun Morogh or  in Durotar during the Brewfest Event.