Teitessa 15 Year Edition Japanese WhiskyTeitessa 15 Year Old Grain Japanese Whisky is the youngest Spirit in the Teitessa lineup right now and thats saying something. All three Spirits start with the same single grain foundation as all three of their signature drams. Due to the distillerys nearly two hundred year history crafting Saki and Shochu, the single grain is most likely rice fermented with koji. The Spirit was then aged in American white oak for fifteen years.