Mikawa (Aichi Prefecture), Japan — commercial production from Edo period
Hon-mirin (true mirin) is a fermented rice wine sweetener with 14% ABV, produced by fermenting steamed mochi rice with rice koji and shochu over 40–60 days until the koji enzymes convert the rice starches to sugars, creating a naturally sweet, golden syrup with complex flavour. It is not simply 'sweet sake' — its flavour is umami-sweet with caramelisable sugars that create the characteristic glazing and caramelisation (Maillard reaction) in tare, teriyaki, and nitsuke. Three tiers exist: hon-mirin (true, naturally fermented, ~14% ABV, legally classified as alcohol); mirin-fu chomiryo (mirin-style seasoning, 1% ABV or less, no alcohol tax, less complex); and shio-mirin (with added salt to avoid alcohol classification). Hon-mirin is the only professional choice; the others are convenience products that lack the depth and caramelisation properties of genuine mirin.
Complex, umami-sweet, caramelisable — more depth than sugar; adds golden colour to glazes; rounds acidity and softens sharp edges in seasoned dishes
Hon-mirin must be added to heat to activate its Maillard browning potential; it tenderises protein (enzymes and sugar interaction); suppresses fishy odours through alcohol volatilisation; in tare preparation, mirin is 'cooked off' by brief simmering before other ingredients are added; the sugar composition of hon-mirin (glucose, maltose, isomaltose, higher sugars) creates a less cloying sweetness than refined sugar.
Burn off mirin's alcohol before using in cold applications (e.g., for marinade bases): simmer briefly, ignite with a match to flame off alcohol, cool; top-grade hon-mirin from Mikawa (Aichi Prefecture) is the professional benchmark; aged mirin (3+ years) develops remarkable depth — some luxury honteriyaki restaurants use 10-year mirin; the sediment (mirin kasu) from mirin production is itself a seasoning paste used in pickling.
Using mirin-fu chomiryo as a substitute for hon-mirin in professional applications (produces inferior flavour and poor caramelisation); adding mirin late in cooking without allowing the alcohol to cook off (leaves a raw, harsh sweetness); overusing mirin to compensate for lack of depth in other ingredients; failing to differentiate between mirin's role (complex sweetness, glaze, aroma) and sugar's role (simple sweetness only).
Japanese Cooking: A Simple Art — Shizuo Tsuji