A pineapple
The pineapple (Ananas comosus) is an edible fruit native to the planet Earth.
Pineapple was Malcolm Reed's favorite food, despite the fact that he was allergic to the bromelain it contains. From the mid-2140s, he had been taking regular injections to overcome the allergy. Phlox revealed this fact to Ensign Hoshi Sato in 2151, leading her to prepare a pineapple cake for Reed's birthday. (ENT: "Silent Enemy")
The crew assigned to the day shift on Deep Space 9 enjoyed a short stack of pancakes, dripping with butter, with a side of sausage and pineapple for breakfast. (DS9: "The Assignment")
Harry Kim wore a Hawaiian shirt with a pineapple motif to a Hawaiian luau aboard the USS Voyager in 2373. (VOY: "Alter Ego")
At the end of the DVD and Blu-ray commentary track for 2009's Star Trek producer Damon Lindelof states that the film's sequel will be called "Pineapple." On the day of the discs' release, Nov. 17, 2009, an image of a pineapple was posted as a clue in the "Lost" alternate reality game at damoncarltonandapolarbear.com. Lindelof was the co-creator, writer and producer of "Lost."