Hon-Mirin

Hon-mirin is produced by combining steamed glutinous rice (mochigome), rice koji (Aspergillus oryzae cultured on rice), and distilled rice spirit (shōchū). Enzymes from the koji hydrolyze the rice starch into glucose and maltose and the rice protein into amino acids over a 60- to 90-day fermentation. The shōchū prevents undesired microbial activity and dissolves out aromatic compounds.

The finished liquid contains approximately 13–14 percent alcohol by volume, naturally derived sugars (primarily glucose and maltose), free amino acids, organic acids, and aromatic compounds. The alcohol content places hon-mirin under Japan's Liquor Tax Act in addition to the Food Sanitation Act.

Aichi Prefecture (the Mikawa region — Hekinan, Kariya, Handa, and surrounding cities) and Chiba Prefecture (Nagareyama City) are the historic centers of hon-mirin production. Both regions retain long-established producers operating across multi-generational timeframes.

Hon-mirin must be distinguished from two adjacent product categories: みりん風調味料 (mirin-style seasoning), which is a non-fermented blend of corn syrup, glutamate, acidulants, and flavorings designed to mimic the cooking effect of hon-mirin without the alcohol, and 発酵調味料 / 加塩みりん (salted fermented seasoning), which is a fermented preparation salted out of the Liquor Tax Act scope for industrial food use.

In Japanese cooking, hon-mirin is used for teriyaki and照り glazes, nimono (simmered dishes), sauces, marinades, dashimaki tamago, and noodle tare. The combination of natural sugars, alcohol, and amino acids contributes glaze, gloss, depth of flavor, and a mild tenderizing effect.

Hon-mirin is added at the final stage of cooking when its aroma is desired in the finished dish, or earlier when its alcohol is intended to dissolve and carry away off-aromas from fish or meat (a technique known as 煮切り when the alcohol is boiled off first).

Restaurant and specialty-retail supply chains use long-aged hon-mirin from heritage Mikawa and Nagareyama producers as a finishing seasoning where its complexity carries through the dish.

Hon-mirin contains approximately 13–14 percent alcohol by volume and is regulated as an alcoholic beverage under the Liquor Tax Act (酒税法). Production, transport, and sale require a liquor license.

Hon-mirin is also regulated under the Food Sanitation Act, with compositional specifications set under industry and JAS-related standards for mirin.

「みりん風調味料」 (mirin-style seasoning) contains less than 1 percent alcohol and is regulated only as a food, not as a liquor. Its labeling must distinguish it from hon-mirin.

「発酵調味料 / 加塩みりん」 (salted fermented seasoning) is salted (typically around 2 percent salt) so as to fall outside the Liquor Tax Act as a non-potable preparation, and is used primarily in industrial food manufacturing.