Suntory Umeshu Plum Yamazaki Cask. Of all the Suntory’s assets, the Yamazaki distillery is something of a legend in the Japanese whisky world. It’s behind these distillery walls that Suntory carefully ages its Japanese Umeshu (plum liqueur) in toasted Yamazaki casks. An exotic Japanese liquor, this release is sweet and decadent, bursting with notes of roasted oak. Perfect for fans of the Hibiki 12, as some of the whisky blended into it was aged in these umeshu casks.