What Is Tamari? The Original Soy Sauce, Born From Miso

There is a moment, when a few drops of good tamari meet a warm bowl, where the whole dish seems to deepen. The flavour turns rounder and more savoury, almost meaty, and yet nothing has been added but a dark, gentle liquid drawn from fermented soybeans. This is the gift of tamari, and its story begins not with a sauce at all, but with miso.

Tamari is the oldest member of the soy sauce family, and the closest to the very first soy sauces that travelled to Japan from China. Where an everyday soy sauce leans on wheat, tamari leans almost entirely on the soybean, and that single difference shapes everything about it: the colour, the body, the depth of flavour, and the reason so many gluten-free kitchens keep a bottle close.

What is tamari?

Tamari is a Japanese soy sauce made mainly from fermented soybeans and koji (the traditional culture Aspergillus oryzae), with little or no wheat. Its name comes from the Japanese word tamaru, meaning to gather or to pool, because the original tamari was exactly that: the rich, dark liquid that pools and collects as a barrel of soybean miso slowly ages and ferments. Correctly, this ancestral form is called miso-damari, the liquid essence of the miso itself.¹

For centuries this pooled liquid was the most prized part of the ferment, drawn off and kept for the finest dishes. It is often described as the original Japanese soy sauce, the one nearest to the soy sauce first brought over from China, and it has long been made in the Chubu region around Nagoya.¹ Everyday soy sauce, by contrast, is a later, wheat-rich style. Tamari is where the tradition began.

Na'vi's own Organic Miso Damari is made in this ancestral style, the true liquid essence drawn from ageing miso by makers who still honour the old craft, rather than a fast, modern brew.

What is the difference between tamari and soy sauce?

The heart of the difference is wheat. A standard soy sauce is brewed from a large proportion of wheat alongside the soybeans, sometimes close to half and half. Tamari is soybean-led, with little or no wheat at all. That changes the character of the sauce in the bottle and on the plate.

Because tamari draws more of its flavour from the soybean, it carries a richer, more rounded umami and a smoother edge, where a wheat-based soy sauce is brighter and sharper. Neither is better, they are simply different tools. Tamari is the one to reach for when you want depth, body and a cleaner soybean savouriness.

Where does shoyu fit in?

You may also see the word shoyu, which is simply the Japanese word for soy sauce. In practice, when people say shoyu they usually mean the standard, balanced Japanese style made with roughly equal parts soybean and roasted wheat. So it sits between the two: made much like tamari, but with wheat added for that brighter, slightly sweeter note. Tamari is the soybean-led original, shoyu is the balanced everyday soy sauce, and generic soy sauce is the lighter, wheat-heavy version.

Is tamari gluten-free?

This is the question that brings most people to tamari, and it deserves an honest answer. Traditionally tamari is wheat-free, which is why it has become the natural gluten-free alternative to soy sauce. But wheat-free is not automatic across every product that carries the name. Some tamari does contain a small amount of wheat, so the word alone is not a guarantee.

If you are coeliac or sensitive to gluten, look for tamari that is certified gluten-free, tested to below 20 parts per million, and check that the ingredients list shows no wheat. Na'vi's Organic Miso Damari is made without wheat or any gluten-containing grain, from organic soybeans, organic rice, sea salt, koji and spring water, so it is naturally gluten-free by its making. As with any food, if you are managing coeliac disease, always read the label and check for any gluten-free certification before you buy.

What does tamari taste like?

Tamari tastes of deep, savoury umami. It is smoother and less salty-sharp than a typical soy sauce, with a rounded, almost velvety body and a long finish. A good one is thick enough to cling gently to food rather than run straight off. People who cook with it often describe the same thing: that only a little is needed, that a few drops go a long way, and that it lends a richness to a dish that is hard to find elsewhere. It is a seasoning to finish with, as much as one to cook with.

Is tamari healthier than soy sauce?

Here it is worth clearing up a common myth. Tamari is often described online as lower in salt than soy sauce, and that is not reliably true. Standard tamari carries roughly 1,000mg of sodium per tablespoon, which is actually a little higher than regular soy sauce, not lower.² The only genuinely lower-salt option is a reduced-sodium formula, and that is a separate thing from tamari itself.

So tamari is not a health upgrade over soy sauce, and it is honest to say so. What it genuinely offers is a richer, rounder flavour and, when it is wheat-free, a soy sauce that suits gluten-free cooking. Both tamari and soy sauce are high in salt and are best used as a seasoning, a few drops at a time, rather than poured freely. As a guide, UK health advice suggests keeping to no more than around 6g of salt a day, and a single tablespoon of tamari already holds a meaningful part of that.²

Can you use tamari instead of soy sauce?

Yes, and it is one of the simplest swaps in the kitchen. Tamari can replace soy sauce one for one in almost any recipe. Because it is richer and a little less sharp, some cooks start with a slightly smaller amount and adjust to taste. For gluten-free households it is the natural stand-in, letting you keep the deep savoury note of soy sauce in stir-fries, marinades and dressings without the wheat.

How do you use tamari in cooking?

Tamari is wonderfully versatile, and its body and depth show best when it is not lost in a crowd of other flavours.

• As a dipping sauce. Its smoother, rounder salinity makes it the classic dip for sushi, sashimi and dumplings. Try it with a little grated ginger and a single drop of toasted sesame oil.
• In marinades and glazes. It clings beautifully. Pair it with maple or honey, garlic and ginger for tofu, tempeh, fish, mushrooms or vegetables.
• In stir-fries. Add it toward the end, off the heat, for a cleaner, deeper umami hit rather than cooking it down hard.
• In dressings. One part tamari, one part rice vinegar and half a part sesame oil makes a simple, savoury dressing where its body really tells.
• As a finishing seasoning. A few drops lift soups, noodles, roasted vegetables and rice. This is where a good tamari earns its place.

Because it is concentrated, treat it as you would a fine seasoning. A little, tasted and adjusted, almost always beats a heavy hand.

How do you store tamari?

Tamari is naturally stable thanks to its salt, so an unopened bottle keeps its quality for a long while in a cool, dark cupboard, up to its best-before date. Once opened, keeping it in the fridge protects its flavour and colour best, and it stays at its finest for several months after opening. Keep the cap closed tightly and away from heat and light, and follow the guidance on the label.

References

1. Wikipedia. "Soy sauce" (tamari section). en.wikipedia.org/wiki/Soy_sauce
2. United States Department of Agriculture (USDA) nutrition data for soy sauce made from soy (tamari), per NutritionValue.org. nutritionvalue.org. UK salt guidance: no more than 6g per day (NHS Eatwell).