Cinnamon

Image Source: Kevin Harber (2010) 
https://www.flickr.com/photos/kevharb/4326485386

"Cinnamon is an ancient spice with roots dating back to 2,000 BC. It has a wide variety applications ranging from baked goods and drinks to incense and perfumes, and is a wonderful tea for a cough. The inner bark of the smaller branches is the part used to make the spice. Cinnamon can be grown easily in Hawaii with adequate rainfall. Cinnamon trees are very sensitive to herbicide, mulch is a better weed control. Prune to encourage a bushy tree that is easy to harvest. Cinnamon is a rich source of vitamin K, Iron and Calcium."

Source: Plant It Hawaii (2020) https://www.plantithawaii.com/exotics

Image Source: Simon A. Eugster (2015) Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Cinnamomum_verum_spices.jpg#filelinks