Vanilla is a type of plant product that grows native to the planet Earth. Many Earth animal lifeforms are known to consider vanilla to be an appealing aroma, and it is prized as an edible ingredient to food by the Human civilization.
Vanilla was known to be consumed as a foodstuff available in the Federation in the 23rd century. Mars Foods Incorporated advertised themselves as a supplier of vanilla in Spacelanes, a periodical publication in the late 23rd century. (FASA RPG module: Spacelanes: The Magazine of Interstellar Trade)