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.
Complex rounded sweetness from multiple sugars; golden, viscous; caramelises beautifully; contributes lustre and depth without sharpness
{"Enzymatic production: koji amylases convert glutinous rice starch to natural sugars — no added sugar","14% alcohol content: contributes deodorising function and distinguishes from imitation products","Tsuya (lustre) function: high sugar content caramelises on heat to produce lacquer glaze","40–60 day maturation minimum; premium aged versions (hidane mirin) aged 3–10 years","Hon mirin vs mirin-fu: fundamentally different products; imitation lacks alcohol and enzymatic complexity"}
{"Hon mirin can be drunk as a dessert sake — aged hidane mirin rivals fine sweet wines","For teriyaki glaze: reduce mirin by 20% before combining with soy — concentrates sugars for better lacquer","Nikiri mirin: briefly heat hon mirin to burn off alcohol before using in raw applications (dressings, sashimi)","Aged hon mirin (3+ years) has amber colour and extraordinary caramel depth — worth seeking out"}
{"Using mirin-fu chomiryo (imitation mirin) — produces flat sweetness, no glaze, no deodorising","Adding mirin off heat in teriyaki — must cook with heat to allow alcohol to evaporate and sugar to caramelise","Not burning off alcohol first when used in cold applications — raw mirin alcohol is harsh","Substituting sake + sugar — acceptable approximation but misses the complex multi-sugar sweetness"}
Tsuji Shizuo, Japanese Cooking: A Simple Art