Karamja rum

Karamja rum is a strong rum brewed on Karamja. You can buy Karamja rum from Zambo who runs the the Karamja Wines, Spirits, and Beers shop for 30gp. 
Karamja rum cannot be taken to the mainland on the boat and if you try it will be taken from you by a Customs officer. It is also impossible to take the rum from Karamja by means of teleporting, as the bottle will immediately break in teleportation.  The only way to get a bottle of Karamja rum to the mainland is to hide it in a crate of bananas being shipped from Luthas's banana plantation to Wydin's Food Store in Port Sarim.
Karamja rum is used in the quest Pirate's Treasure where you must smuggle a bottle to Redbeard Frank by the priorly stated means in exchange for treasure.