Yamaroku 4 Years Aged Soy Sauce, Tsuru Bisiho, 5 OunceTsurubishio is the flagship series of soy sauce for Yamaroku and is aged the longest between 3 5 years. "Tsuru" Means "crane" And "Bishio" Means "condiment". In Japan, cranes are regarded as auspicious birds and symbolize longevity. It is said the song of cranes can reach the heavens, and Yamaroku wants this soy sauce To be like the cranes which can reach the heavens and be known to everyone. Tsurubishio is characterized as having a rich mellow flavor