This is an editted version of an article I did many years ago covering the basic information about sake.
Some guidelines on making workable martial art styles within a game.
Twenty questions to help create a cult.
Another real world thing. White tea. Can only be picked two days a year, the two days before the flowers blossom. Could be a similiar plant that...is the deadliest poison known, cure known diseases or psychosis, or a potent herb that just tastes awesome.