Recipe: Captain Rumsey's Lager

Recipe: Captain Rumsey's Lager is a recipe that will create 5xCaptain Rumsey's Lager for every Skin of Dwarven Stout and Flagon of Dwarven Mead.

Source
Found in Bag of Fishing Treasures (Terokkar Forest) from the various fishing daily quests.

As well as the Crate of Meat, Barrel of Fish, and Small Spice Bag from the various cooking daily quests.