If you've never had hon (translating to authentic or original) mirin, you are in for a real surprise.
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Background
For an excellent background on this traditional brewery, I can do no better than the experts at Oishi so Japan. Check out their article and brewery tour. It's fascinating!Ā
Brewery: Hakusen Shuzou
Rice: Local (Hida, Takayama, Gifu)
Location: Gifu
Ingredients: rice shochu (distilled in house), local glutinous rice, koji, yeast