Generic aromatic spice derived from the dried inner bark of any of several varieties of tropical evergreen tree used as a flavoring additive for drinks in extract from or as a constituent of liqueurs and bitters - and as a garnish either as a tightly rolled rod (cinnamon stick) or as a ground powder sprinkled over the surface of a drink. Most often what we know as cinnamon is really Cassia - otherwise known as Bastard Cinnamon.
Generally available. Distributed world-wide. Available for on-line ordering in some markets.