Saikyo miso vs. Sanuki shiro miso | which to use for which dish

"How is Saikyo miso different from shiro miso?" The short answer: shiro miso is the umbrella name for pale, sweet miso made with plenty of rice koji, and Saikyo miso is the part of that family made in Kyoto. They are not rival categories. Saikyo miso sits inside the larger circle of shiro miso.

Refined in Kyoto, though, its koji ratio, salt level and aging fall into a clear balance, and the shape of the taste differs from shiro miso made elsewhere. Here is the difference, laid out so you can take it in at once.

Saikyo miso and shiro miso, in 1 line

Remember it as "shiro miso is the category, Saikyo miso is the name narrowed by where it is made," and the supermarket shelf stops being confusing.

The name "Saikyo" is pride in the capital's miso

To put it again: shiro miso is the umbrella name for pale, sweet miso made with plenty of rice koji. It is made outside Kyoto too, including Sanuki shiro miso in Kagawa. Within that family, the shiro miso made in Kyoto is what gets called Saikyo miso.

The name is said to come from the Meiji Restoration, when the capital moved to Tokyo and people began calling Kyoto "the western capital," Saikyo. The house that carries that name as its own is Saikyo Miso, founded in 1830, which descends from a supplier to the Kyoto Imperial Palace. It is the original home of shiro miso.

3 things that separate them

Once you know Saikyo miso is a kind of shiro miso, three practical points divide it from shiro miso made elsewhere.

1. Koji ratio: Saikyo miso is typically brewed with roughly twice as much rice koji as soybeans. Sanuki shiro miso and other regional shiro miso also run high, but in Saikyo miso it is especially marked.
2. Salt: about 5%. Sanuki shiro miso is close, at roughly 5 to 6%, and both come in at less than half of ordinary miso at about 12%. Think of low salt as something shared across all sweet shiro miso.
3. Aging: Saikyo miso is a briefly aged "young miso." The color is a pale cream, the scent is quiet, and it carries none of the weight that long aging gives red miso.

The blueprint for sweetness: twice the koji, half the salt

Of those three points, what sets Saikyo miso's sweetness is mainly the koji ratio and the salt. The sweetness is designed, not accidental.

First, the koji ratio. It is brewed with a generous roughly 2 parts rice koji to 1 part soybeans. The koji enzymes turn the rice starch into sugar, and a full sweetness appears without any sugar being added.

Second, salt. Where ordinary miso sits around 12%, Saikyo miso is about 5%, less than half. With the salt pulled back, the sweetness comes straight forward.

Third, the aging period. Unlike red miso, which deepens in color and savor over long aging, this is finished as a briefly aged "young miso," so the color stays a pale cream and the texture turns silk-smooth.

Salt levels, lined up against other miso

For Saikyo miso, "sweet means low in salt" really does hold. Lined up with the main types, its place becomes clear.

Put in terms of a tablespoon (18g), Saikyo miso works out to roughly 0.9g of salt. The same amount of Shinshu miso is about 2.2g, so a single bowl of miso soup differs by around 1g.

There is a catch here, though. Because Saikyo miso is gently sweet and the salt does not assert itself, it can read as "thin," and you reach to add more. That is why white miso zoni recipes call for a larger amount than an ordinary miso soup. If you are choosing it to cut salt, keep an eye on how much you use.

Low salt is a decision about taste and, at the same time, the flip side of shorter keeping. That comes next.

1 to 2 months once opened: the fate of a young miso

Salt does not only set the taste; it also guards against spoilage. Half the salt means half that guard.

Saikyo miso is also a briefly aged "young miso," so the safe course is to keep it in the refrigerator after opening and use it up within 1 to 2 months. Left at room temperature, the color shifts darker and the pale tone and sweet scent that are its whole point disappear fast. This is not spoilage but sugars and amino acids reacting and browning, a natural change; in Saikyo miso, though, it means losing the very thing that makes it itself.

If you are not going to finish it, seal it and freeze it. Miso holds salt and sugar, so it never freezes solid in a home freezer and you can spoon it straight out. Freezing is the surest way to keep the color and scent.

Saikyo Shiro Miso Josen: the white the palace loved

Saikyo Miso's "Saikyo Shiro Miso Josen" is the standard bottle carrying this method into the present. Sablefish Saikyo-zuke. The white miso zoni of a Kyoto New Year. The soft, unhurried sweetness people call "hannari" in Kyoto cooking comes from this miso.

Low salt means it keeps for less time than ordinary miso, but that is the trade for the sweetness, the nature of a young miso.

Choosing between them, dish by dish

Can you use Saikyo miso in a recipe that says "shiro miso"? In most cases, yes. But its koji ratio and sweetness come through especially strongly, so keep the following in mind when you swap.

• Kyoto-style white miso zoni: Saikyo miso is the standard here. Other regional shiro miso will work, but the soft Kyoto sweetness comes out most readily with Saikyo miso.
• Saikyo-zuke (西京漬け): the dish that took its name from this miso in the first place. Substitute Sanuki shiro miso and the quality of the sweetness and the scent shift a little.
• Sumiso-ae (酢味噌和え), also called nuta: any shiro miso works. With Saikyo miso the sweetness stands up, so tighten it with vinegar and mustard to bring it into balance.
• An everyday miso soup: the low salt can leave it feeling short, so pairing it with red miso or a blended miso settles the taste.

How to enjoy Saikyo miso

• Saikyo-zuke: marinate sablefish, Spanish mackerel or chicken for 2 to 3 days
• Kyoto-style white miso zoni with round mochi
• As the base for sumiso-ae (nuta)
• Worked into butter for a miso butter sauce. Good with salmon and mushrooms
• Loosened with soy milk as a background note in a Western soup

Start with Saikyo-zuke. Marinate, grill, and a plate of Kyoto cooking arrives on a home table.

Frequently asked questions

What is the difference between Saikyo miso and shiro miso?

Shiro miso is the umbrella name for pale, sweet miso made with plenty of rice koji, and it includes Sanuki shiro miso from Kagawa. Saikyo miso is the name for the shiro miso that has been made in Kyoto, so the two are not rival categories but nested ones: Kyoto-made, within shiro miso. The brewery that gave the style its name, Saikyo Miso, was founded in 1830 and descends from a house that supplied the Kyoto Imperial Palace. Its markers are a high koji ratio and salt at about 5%.

Can I use Saikyo miso in a recipe that calls for shiro miso?

In most cases, yes. But Saikyo miso has a high koji ratio and a pronounced sweetness, so it fits Kyoto-style white miso zoni and Saikyo-zuke best, while in sumiso-ae the sweetness comes forward and the dish settles better if you tighten it with vinegar and mustard.

Why is Saikyo miso sweet?

It is brewed with roughly twice as much rice koji as soybeans, so the sugars the koji enzymes draw out of the rice come through strongly. On top of that, salt sits at about 5%, less than half that of ordinary miso at about 12%, and the aging period is short, so sweetness stands ahead of salt.

What dishes can I use Saikyo miso in, and where can I buy it?

The standards are Saikyo-zuke with sablefish or Spanish mackerel, the white miso zoni eaten in Kyoto at New Year, and sumiso-ae. It also goes well with butter and soy milk, which makes it useful as a background note in Western cooking. Saikyo Miso's "Saikyo Shiro Miso Josen" is available online, including on Amazon.

How much salt does Saikyo miso contain? Is it a low-salt choice?

Saikyo miso runs about 5% salt, less than half that of ordinary rice miso or Shinshu miso at about 12%. A tablespoon (18g) works out to roughly 0.9g of salt, against about 2.2g for the same amount of Shinshu miso, so a bowl of miso soup differs by around 1g. That said, the strong sweetness tempts you to use more, so if lower salt is the goal, watch the amount you use as well.

Does Saikyo miso keep well? How should I store it?

Because it is a "young miso," low in salt and briefly aged, it keeps less well than ordinary miso. After opening, store it in the refrigerator and use it up within 1 to 2 months. Left longer, the color darkens and the pale tone and sweet scent that make shiro miso what it is are lost. If you cannot finish it soon, seal it and freeze it; it does not harden, so you can spoon it straight from the freezer.