Tonburi is a type of edible seed, sometimes called “land caviar” is the dried seed of the summer cypress Kochia scoparia, a speciality of Akita prefecture in Japan. After harvesting the cypress for its seeds, they are boiled and soaked in cold water for about a day. The outer skin is removed by rubbing it by hand, and it has a similar texture to caviar. It is used in Chinese medicine for urinary diseases and eye fatigue, among other things.