International Arms Race Zero IBU IPA, an India pale ale that measures zero international bitterness units because it contains no hops, drawing its spicy character instead from a blend of spearmint, bay leaves, juniper, rosemary, elderflower and orange and lemon peel. * Editors Note* - Hops have been replaced by traditional ingredients to replace the bitterness typically imparted by hops. This makes the beer a traditional Gruit style.