Natto Explained: Taste, Texture, Smell, and How People Eat It

Most people assume natto is an acquired taste that takes years to appreciate. That framing undersells it - natto isn't waiting to become palatable.

It's already doing something that very few ingredients can: delivering anchovy-depth umami alongside a fermented funk that aged cheese only approximates. The barrier is familiarity, not flavor.

What Is Natto?

Natto is whole soybeans fermented with Bacillus subtilis var. natto, a bacterial culture that breaks down proteins and produces the ingredient's signature sticky, web-like strands.

It originated in the Kantō region of Japan and has been a traditional breakfast food for centuries, typically sold in small plastic tubs or vacuum packs with single-serving condiment sachets inside.

The soybeans themselves are small, pale brown, and soft. Their surface is coated in viscous strands that stretch dramatically when stirred - a texture that surprises first-time eaters.

Two main styles exist: itohiki natto (the common stringy type) and hikiwari natto, made from hulled, crushed soybeans, which has a finer texture and slightly milder character.

What Does Natto Taste Like?

The closest comparison most people reach for is aged cheese - a funky, almost ammoniated sharpness sitting over a deep savory base.

That's accurate, however natto also carries a bitter edge that cheese doesn't, plus the clean protein sweetness of cooked soybeans underneath everything.

Stirring activates the flavor. More air contact during mixing intensifies both the tang and the aroma, which is why Japanese cooks often stir natto vigorously before serving. Heat mellows the sharpest notes - folded into hot rice or noodles, the ammonia-like top note softens while the umami core remains. Raw egg yolk rounds out the bitterness without masking the fermented character.

Karashi mustard - the sharp yellow variety included in most packaged natto - cuts through the heaviness and brings the flavor into better focus. Without it, the profile can feel one-dimensional.

How to Eat Natto

Natto is served raw or at most gently warmed by contact with hot food. Long cooking destroys the probiotic bacteria and dulls the fermented character.

The standard approach is simple: open the tub, add the included soy sauce and karashi mustard packets, stir vigorously, and spoon over hot white rice.

Shiso leaf is a natural pairing - its herbal brightness cuts through natto's funk without competing with the umami. If shiso isn't available, look up alternatives to shiso that carry a similar anise-forward quality. Tamari works better than standard soy sauce for adding depth without excess salt; if you're out, there are solid alternatives to tamari worth knowing. A small amount of kimchi alongside natto rice creates a layered fermented pairing that's worth trying.

How to Buy and Store Natto

Look for tubs or vacuum packs with firm, intact seals and no bulging - a swollen package signals over-fermentation or bacterial overgrowth.

The soybeans inside should be small, uniform, and pale brown.

Avoid packs with excessive liquid pooling at the bottom or any visible white fuzzy mold (distinct from the normal sticky protein film coating each bean).

Check the manufacture date; fresher is noticeably better in aroma and texture.

Opened natto keeps for just 24-48 hours in the coldest part of the fridge. Seal it tightly; the aroma transfers to surrounding foods quickly.

Frozen, unopened tubs last up to 3 months. If you're pairing natto with rice regularly, it's worth knowing how long rice keeps so both components stay fresh together.

Start Here If You're New to Natto

Try the simplest entry point first: one tub over hot short-grain rice with the included condiments. Don't skip the mustard. If the texture is the obstacle, hikiwari natto's finer, less stringy consistency is an easier starting point.

Use natto in small amounts inside okonomiyaki batter or mixed into a miso-based dressing before committing to it as a standalone dish - knowing okonomiyaki's shelf life helps you plan ahead if you're batch-cooking.

The flavor rewards patience and repetition.