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30 May 2026

Salt, Rice, Seaweed: The 3 Things That Make (or Break) an Onigiri

The secret to a great onigiri isn't the filling — it's the salt, the rice and the seaweed. A Byron Bay onigiri maker explains the three things that really matter.

Two finished onigiri — one topped with flaked salmon, one with tuna — wrapped in dark nori, beside a clay pot of rice and trays of fillings

Everyone asks about the filling. What's inside? Tuna mayo? Salmon? Pickled plum?

But here's a secret we've learned pressing onigiri at the markets: the filling is the least important part. An onigiri is so simple that there's nowhere to hide — and three things, not the filling, decide whether it's any good. The salt. The rice. The seaweed.

Get those three right and almost any filling will sing. Get any one of them wrong and the best filling in the world can't save it.

A black clay donabe pot with a scorched base sitting over a blue gas flame
It starts before the filling ever enters the picture — rice cooked in a donabe over an open flame.

1. Salt — the seasoning you shouldn't taste

Salt is the smallest ingredient and the easiest to get wrong.

Done right, you shouldn't taste "salt" at all. You should taste rice that suddenly tastes like more — rounder, sweeter, more itself. It's a seasoning, not a topping.

The traditional way is salt on damp hands just before shaping, so it lives on the surface of the rice ball. That first contact with your lips is the brightest part of the bite. It does a quiet second job too: a little salt firms the surface and helps the ball hold its shape — and historically, it helped the rice keep longer.

Gloved hands taking a pinch of salt from a small dish onto damp palms before shaping rice
Salt goes onto damp hands, not into the rice — so it sits on the surface where you taste it first.

In a dish this plain, the quality of the salt comes through. A clean sea salt with a bit of mineral character beats a sharp, flat table salt every time.

A bag of artisanal Japanese sea salt from a small Goto Islands saltworks held over a wooden table
A clean sea salt with real mineral character — worth the fuss in a dish this plain.
Coarse white sea salt being poured from its bag into a small ceramic dish
Coarse, hand-harvested crystals — a world away from flat table salt.

The salt we reach for is んまか塩 (unmaka-shio) from Yuriya Saltworks, a tiny producer out on the Goto Islands, off the coast of Nagasaki in southern Japan. They make it the slow way — simmering Goto seawater over a wood-fired kettle until all that's left is coarse, mineral-rich crystals. (Unmaka means "delicious" in the local Goto dialect, which feels about right.) It's salt you can happily taste on its own, which is exactly what you want sitting on the surface of a rice ball.

Map of Japan with a pin marking the Gotō Islands off the southwest coast, near Korea
Off the southwest tip of Japan, past Nagasaki.
Close-up map of the Gotō Islands chain — Fukue Island and Nakadōri Island — off the coast of Nagasaki
The Gotō Islands, where Yuriya Saltworks makes んまか塩.

2. Rice — the part that's actually the star

Everyone focuses on the filling. The rice is the meal.

  • The right variety, cooked right. Short-grain Japanese-style rice has the natural stickiness that lets an onigiri hold together without being squashed. Washed well, cooked properly, then rested so the moisture evens out.
  • Warm, not hot. Firm, not mushy. Shape it while it's warm and the grains cooperate. Each grain should still feel separate — you're coaxing them together, not crushing them.
  • A light hand. The single biggest mistake people make is squeezing. A good onigiri holds its shape but feels airy and gives a little when you bite. Press too hard and you get a dense rice brick.
  • Freshness matters. Rice is at its best within hours of cooking. That's the whole reason we make small batches on market mornings instead of pressing everything the night before.
A donabe pot of freshly cooked, glistening white short-grain rice still steaming
Freshly cooked short-grain rice, still steaming — this is the part that's actually the star.
Gloved hands cupping a hand-pressed triangular rice ball, a second mound of rice resting on the board
A light hand: you're coaxing the grains together, not crushing them into a brick.

3. Seaweed — texture, aroma, and the great crisp-vs-soft debate

The seaweed does two jobs: it adds a savoury, slightly smoky note from the sea, and it gives you something to hold.

Good seaweed smells faintly of the ocean — that's the sign of quality. A quick toast over heat wakes up the aroma and makes it snap.

So where does the best nori come from? For us, the answer is the Ariake Sea (有明海) — the shallow inland sea ringed by Saga, Fukuoka, Kumamoto and Nagasaki in northern Kyushu. It has the largest tides in Japan, and twice a day the water pulls right back to reveal kilometres of glistening mudflat. The nori is grown on poles staked into those flats, so every time the tide drops it's bathed in sun and air before the sea rolls back in.

And here's the thing about that water: it might look like plain brown mud, but it's anything but. Big rivers pour down off the Kyushu mountains into this near-enclosed sea, carrying a constant load of minerals and nutrients, and the huge tides stir it all up and keep it rich. That muddy-looking sea is basically a soup of nourishment — and the nori drinks it in. That's what gives Ariake nori its tenderness, its deep colour and a soft, almost sweet ocean aroma. It's widely considered the finest in the country.

A person sitting on a seawall looking out over the vast exposed mudflats of the Ariake Sea at low tide, with rows of nori cultivation poles running toward the horizon
Low tide on the Ariake Sea — the nori poles run all the way to the horizon.
The wide grey tidal flats of the Ariake Sea at low water, dotted with nori farming poles and a distant shoreline
Japan's biggest tides expose kilometres of flat — and bathe the nori in sun and air twice a day.

And then there's the debate that splits the crowd at our stall every single weekend: crisp or soft? Some people love seaweed wrapped on early, so it softens into the rice. Others want it crisp and snapping. Neither is wrong — it's genuinely a matter of taste. (The trick to keeping it crisp, by the way, is the same one the convenience stores figured out: keep the seaweed separate from the rice until the moment you eat.)

An onigiri-making station with a tray of toasted nori sheets, fresh rice, and trays of salmon and tuna fillings
Toasted nori kept to the side — added at the last moment so it stays crisp.

The takeaway

Filling gets all the attention, but salt, rice and seaweed are what actually make an onigiri. They're humble ingredients, and that's exactly the point — there's a quiet Japanese idea here that something simple, made carefully, can be more than enough.

Come taste the difference

We obsess over these three things so you don't have to. If you want to know what good rice, the right pinch of salt and proper toasted seaweed taste like together, the easiest way is to try one.

A full onigiri-making spread — hand-pressed rice balls, a dish of salt, trays of salmon and tuna, nori and a donabe of rice
Salt, rice, seaweed — and a filling tucked in the middle almost as an afterthought.

Find Pocket Rice at the weekend markets around Byron Bay — follow @pocket_rice_byronbay for this week's location.