Mirin Authentic Hon Mirin Technique
Japan (Mikawa region Aichi Prefecture traditionally dominant production; Shizuoka also major)
Hon mirin (本みりん, 'true mirin') is a naturally fermented sweet rice wine produced by combining steamed glutinous rice (mochigome) with rice koji and shochu (distilled spirit) and allowing the koji enzymes to convert the starches to sugars over 40–60 days of maturation. The result is a golden, viscous liquid with 14% alcohol content and approximately 45% natural sugar — produced entirely without added sugar by the enzymatic action of the koji. The sweetness is complex and multi-layered, containing glucose, maltose, and oligosaccharides that produce a rounded, non-sharp sweetness distinct from plain sugar. Beyond sweetness, hon mirin contributes lustre (tsuya) to glazed dishes, helps teriyaki achieve its characteristic lacquer sheen, reduces fishy odours through its alcohol content, and contributes umami amino acids from the koji fermentation. The key distinction is between hon mirin (true product) and mirin-fu chomiryo ('mirin-style seasoning') — the cheap industrial substitute made with corn syrup, salt, and flavouring which contains only 1% alcohol and contributes none of the glazing, deodorising, or flavour complexity of true hon mirin.