Mirin is a sweet rice wine for cooking with an alcohol content of about fourteen percent. It is made by fermenting rice with koji starter, just like sake, not by sweetening with sugar or vinegar.

Is mirin a sauce or a vinegar?

Neither. Mirin is a fermented rice wine; it has neither the acidity of vinegar nor the thickness and composition of a sauce. The confusion arises because in English it is rarely called by the correct word "wine," even though by its method of production it is closest to exactly that.

How does hon-mirin differ from "mirin-style seasoning"?

Hon-mirin (本みりん) is real fermented mirin with about 14% alcohol, which is legally considered an alcoholic beverage. "Mirin-style seasoning" (みりん風調味料) is a syrup based on glucose and molasses with almost no alcohol, invented as a cheaper substitute without the alcohol tax.

Does mirin contain alcohol?

In real hon-mirin — yes, about 14% by volume, the same as in a light sake. But in "mirin-style seasoning" there is less than 1% alcohol, even though the name on the package sounds the same.

How does mirin differ from sake?

Both drinks are made by fermenting rice with koji, but mirin is noticeably sweeter and intended for cooking, not drinking, while sake is the opposite. In sugar content and purpose they are two different products from the same technology, not a strong and a weak version of the same thing.

Mirin: the sweet rice wine that Japan doesn't drink but cooks with

Mirin is not a sauce or a vinegar, as it is sometimes called, but a sweet rice wine for cooking with an alcohol content of about fourteen percent. It is made by fermentation, not with sugar: the sweetness in mirin comes from rice that koji starter has broken down. On a Japanese shelf, this one word hides three different products, and mirin is added to a dish not for sweetness but for what it does to the taste and appearance of the food.

Mirin is most often searched for as a "sauce" or a "vinegar" — but neither describes this liquid correctly. Let's look at what mirin actually is, why it is added to dishes, and why plain sugar cannot replace it. Separately, we'll cover how real hon-mirin differs from its two cheaper relatives and when this sweet rice wine became a seasoning rather than a drink.

Not a sauce or a vinegar, but a fermented rice wine

In English, mirin is sometimes called a sauce and sometimes a vinegar, but neither fits: it is a wine made by fermenting rice and rice koji starter, just as sake is brewed. Its alcohol content stays around fourteen percent, and its sweetness appears naturally — not because sugar was added to the liquid.

Why sweetness is not the main point here

Mirin is added to a dish not for a sweet taste as such, but for a whole set of effects that fermentation provides: sugars, amino acids, and a small amount of alcohol work together, not separately. Replacing this combination with a single sweetener won't work, even if the sweetness tastes similar.

Gloss, shape, and a mellow taste: what mirin does to food

Mirin gives a dish teri (照り) — that glossy shine on teriyaki and simmered sauces that immediately reads as "properly cooked." It also softens the sharp taste of other seasonings, helps fish and vegetables hold their shape while cooking, and mutes fishy odors in a dish.

Why sugar doesn't solve the same problem

Plain sugar can sweeten a dish, but it won't give either the gloss or the effect on the texture of fish and vegetables that a fermented liquid with amino acids and alcohol provides. So mirin in a recipe is not a source of sweetness that can be swapped one-for-one, but a separate technical technique.

醸 — значение: to ferment, to brew (sake, beer), to cause, to give rise to — онъёми: ジョウ — кунъёми: かも.す — 20 штрих(ов). 醸 — "to ferment, to brew (wine)": the key character for this whole page, because mirin is not sweetened but fermented. The same character appears in 醸造 (jōzō) "brewing, winemaking" and 醸造酒 (jōzōshu) "fermented alcohol," as opposed to a distillate like shōchū. The word 味醂 itself does not contain this character — it uses the rare kanji 醂, which originally meant soaking persimmons to remove astringency.

Write 醸 along the guides — the character of "fermentation" that explains where the sweetness in mirin comes from.

Three products under one name on the shelf

Under the word "mirin" in a Japanese store there can be three different products, and it's easy to confuse them:

本みりん (hon-mirin) — real fermented mirin with about 14% alcohol; legally it is an alcoholic beverage, and it is sold accordingly.
みりん風調味料 (mirin-fū chōmiryō, "mirin-style seasoning") — a syrup based on glucose and molasses with added flavorings, less than 1% alcohol, and sweeter than hon-mirin.
発酵調味料 (hakkō chōmiryō, "fermented seasoning") — made the same way as hon-mirin, but with added salt. The salt makes the liquid undrinkable, so the product is not subject to alcohol tax, even though it contains almost as much alcohol as real mirin.

Why two substitutes were needed at all

Both substitutes appeared because of the alcohol tax: hon-mirin as an alcoholic beverage is fully taxed, while "mirin-style seasoning" and "fermented seasoning" are not, so both cost less. They differ noticeably in taste and in the result in a dish, even though the word "mirin" appears on all three packages.

From a drink on the festive table to a seasoning in the kitchen

Before becoming a seasoning, mirin was drunk as a sweet alcoholic beverage — this is already known for certain for the Sengoku period, that is, the 16th century. There are two versions of its origin. According to one, the sweet wine was brought from China via Ryukyu and Kyushu; according to another, mirin appeared in Japan itself from the ancient sweet drinks nerisake and shirozake, to which shōchū was added for preservation.

When mirin moved from the table to the kitchen

As a seasoning, mirin became established noticeably later, closer to the end of the Edo period: it began to be added to eel sauce and soba sauce, and mentions of this survive in the encyclopedia "Morisada Mankō." Sources differ on the exact dating of the transition from drink to seasoning, but agree that it did not happen at once, but over the course of the Edo period.

FAQ

What is mirin?: Mirin is a sweet rice wine for cooking with an alcohol content of about fourteen percent. It is made by fermenting rice with koji starter, just like sake, not by sweetening with sugar or vinegar.
Is mirin a sauce or a vinegar?: Neither. Mirin is a fermented rice wine; it has neither the acidity of vinegar nor the thickness and composition of a sauce. The confusion arises because in English it is rarely called by the correct word "wine," even though by its method of production it is closest to exactly that.
Why is mirin added to dishes?: Mirin gives a dish the glossy shine of teri on teriyaki and simmered sauces, softens the sharp taste of other seasonings, helps fish and vegetables hold their shape while cooking, and mutes fishy odors. Plain sugar does not reproduce this set of effects, because they depend on fermentation, not on sweetness alone.
How does hon-mirin differ from "mirin-style seasoning"?: Hon-mirin (本みりん) is real fermented mirin with about 14% alcohol, which is legally considered an alcoholic beverage. "Mirin-style seasoning" (みりん風調味料) is a syrup based on glucose and molasses with almost no alcohol, invented as a cheaper substitute without the alcohol tax.
Does mirin contain alcohol?: In real hon-mirin — yes, about 14% by volume, the same as in a light sake. But in "mirin-style seasoning" there is less than 1% alcohol, even though the name on the package sounds the same.
How does mirin differ from sake?: Both drinks are made by fermenting rice with koji, but mirin is noticeably sweeter and intended for cooking, not drinking, while sake is the opposite. In sugar content and purpose they are two different products from the same technology, not a strong and a weak version of the same thing.

Sources

Updated: 2026-09-21