Rum
From Memory Alpha, the free Star Trek reference.
Rum was an alcoholic beverage made from fermented sugar cane.
In 2375 Jake Sisko was helping Quark in his bar and was mixing drinks while Quark poured his heart out about Jadzia Dax, as the customer rather than bartender. Quark refused the drink Jake mixed with the words "too much rum, wrong garnish." (DS9: "Once More Unto the Breach")
[edit] Apocrypha
In the Lost Years novel Traitor Winds, Hikaru Sulu told Pavel Chekov about tiramisu by saying that it was "a disgustingly rich dessert made with ladyfingers, espresso, mascarpone cheese, and rum." Chekov was not impressed.
In Ship of the Line, Captain Bateson of the USS Bozeman enjoyed his rum and welcomed Spock on board with a tot of rum at dinner.
The Star Trek: SCE novel Distant Early Warning compared an Andorian alcoholic beverage named "Gredlahr" to rum, but it noted that Gredlahr was sweeter.
