Keg of Thunderbrew Lager

Keg of Thunderbrew Lager is a quest reward from Thunderbrew Lager, an exchange of five hops for one Keg of Thunderbrew Lager.

The quest is either repeatable or has a repeatable counterpart; in any event, the five hops turn-in is repeatable. This is a good thing because you are likely to stumble on the source quest in Westfall and consume the item for the buffs before you get the quest in Redridge for which it is an objective.

As a quest objective
This item is an objective of Dry Times.

You can satisfy this objective with a Keg of Thunderbrew with any number of charges remaining, so it make sense to consume all but one before turning it in.