Air Fryer Yaki Onigiri — Japanese Grilled Rice Balls
Yaki onigiri (焼きおにぎり) is a rice ball that’s been grilled until the outside turns crisp and golden and the soy sauce caramelizes into a savory crust. It’s sold frozen in every Japanese supermarket, it’s a standard izakaya order, and it exists for a very practical reason: it’s what you do with leftover rice.
Traditionally you grill them over charcoal or press them into a hot pan, brushing soy sauce on as they cook. I made these in an air fryer instead, and I’ll be honest — I expected it to be a compromise. It isn’t. Seven minutes on the grill setting and the surface goes properly crunchy, all the way around, with no flipping and no oil. This is now how I make them.
Disclosure: some links below are affiliate links. As an Amazon Associate I earn from qualifying purchases, at no extra cost to you.
Why You’ll Love This Recipe
- No flipping, no oil, no sticking. The single most annoying thing about pan-fried yaki onigiri is that they fall apart when you turn them. In an air fryer you don’t turn them at all.
- Seven minutes. Shape them while the machine preheats and they’re done almost immediately.
- It uses up leftover rice. That’s the entire origin of the dish. Day-old rice actually works better than fresh.
- The seasoning goes inside. Every bite tastes of soy and dashi instead of just the surface — see below.
What is Yaki Onigiri?
Yaki (焼き) means grilled and onigiri (おにぎり) is a rice ball, so yaki onigiri is simply a grilled rice ball. Unlike a normal onigiri, it usually has no filling and no nori — the point is the crust. The rice on the outside dries, browns, and turns crunchy while the inside stays soft, and the soy sauce that hits the hot surface caramelizes into something much more savory than plain soy sauce tastes.
You’ll find them at izakaya, at summer festival stalls, and in the freezer aisle of every supermarket in Japan. At home they’re a way of rescuing rice that’s gone slightly hard in the fridge. If you want the filled, wrapped version instead, I have Spam onigiri and myoga onigiri as well.
Mixed In, Not Brushed On
Most English recipes tell you to shape plain rice balls and then brush soy sauce onto the outside as they grill. I do it the other way around: the seasoning gets mixed through the rice before shaping.
There are two reasons. First, every bite is seasoned rather than just the crust. Second — and this matters specifically for an air fryer — brushed-on soy sauce runs off and burns on the basket, while mixed-in soy sauce browns evenly across the whole surface. The rice goes a light tan color before it even goes in, which is normal.
Ingredients (Makes 4)
| Ingredient | Amount | Notes |
|---|---|---|
| Cooked Japanese short-grain rice | 300 g / about 10.5 oz | Warm, or leftover rice reheated |
| Soy sauce | 1 tbsp | |
| Mirin | 1 tsp | Hon-mirin |
| Toasted sesame oil | 1 tsp | |
| Dashi powder | 1 tsp | One small sachet |
| Katsuobushi (bonito flakes) | A small handful, about 3 g |
The seasoning is four things you’d have anyway if you cook Japanese food: Japanese soy sauce, hon-mirin, toasted sesame oil, and dashi powder. The katsuobushi is what makes these taste like the ones from an izakaya rather than just soy-sauce rice — don’t skip it. All of these are on my list of Japanese pantry essentials.
It also has to be Japanese short-grain rice. Long-grain rice won’t hold together in a ball, and that isn’t a preference — it’s physics.
Equipment
I used a COSORI TurboBlaze air fryer on its grill setting. Any air fryer that reaches around 230°C (450°F) will do the same job — that top-end temperature is what gives you a crust in seven minutes rather than a dried-out rice ball in twenty.
For shaping I use a plastic triangular onigiri mold, which is a ¥100 shop item here and makes all four identical without burning your hands on hot rice. Outside Japan they’re usually sold as part of a musubi maker kit on Amazon — the one I’d point you at includes both the triangular onigiri molds and the rectangular Spam musubi presses. You can absolutely shape them by hand with wet palms instead — that’s how most people do it.
How to Make Air Fryer Yaki Onigiri
Step 1: Start with Warm Rice
Put the rice in a bowl while it’s still warm. If you’re using rice from the fridge, microwave it first — cold rice won’t take the seasoning evenly and won’t hold together when you press it. Slightly dry, day-old rice is ideal here: it browns better than fresh, fluffy rice does.
Step 2: Mix In the Seasoning
Add the soy sauce, mirin, sesame oil, dashi powder, and katsuobushi straight into the bowl and fold everything through with a rice paddle. Cut through the rice rather than stirring it — mashing the grains makes the onigiri gluey. Keep going until the color is even and there are no pale patches left.
Step 3: Shape into Triangles
Pack the rice firmly into the mold and press the lid down hard. Firm is important — a loosely packed onigiri falls apart in the basket. If you’re shaping by hand, wet your palms first, cup the rice, and press it into a triangle with about the same pressure you’d use to make a snowball that has to survive being thrown.
Step 4: Arrange in the Basket
Lay them out with space between them so the hot air can reach every side. No oil, no parchment — the mixed-in sesame oil is enough to stop them sticking, and paper would block the airflow underneath, which is the whole point.
Step 5: Grill at 230°C (450°F) for 7 Minutes
Set the machine to its grill mode at 230°C (450°F) for 7 minutes. Don’t flip them and don’t open the drawer to check — every time you do, the temperature drops and the crust stalls. They’re ready when the surface has gone golden with darker toasted patches on the raised edges.
Step 6: Let Them Sit for a Minute
Lift them out with a spatula rather than tongs — the crust is crisp but the inside is still soft, and tongs will crack them. Give them a minute on the plate before eating. The surface firms up as it cools slightly, and straight out of the basket they’re hot enough to burn your mouth.
Tips and Variations
- Pack them firmly. The most common failure is a rice ball that collapses in the basket, and it’s always because it wasn’t pressed hard enough.
- Use day-old rice. Drier rice browns faster and holds its shape better. Fresh, very wet rice steams instead of crisping.
- Don’t open the drawer. Seven minutes uninterrupted beats ten minutes with two checks.
- Miso version. Swap the soy sauce for a tablespoon of miso mixed with a little mirin. It browns faster, so drop to 5 or 6 minutes and watch it.
- Add a filling. A little grilled salmon or seasoned kombu in the middle works, though classic yaki onigiri is usually plain.
- No air fryer? Press them into a dry non-stick pan over medium heat, three or four minutes a side, turning once with a spatula.
What to Serve It With
Yaki onigiri is usually eaten on its own, in the hand, as a snack or a light supper. If you want to make a meal of it:
- A bowl of miso soup and a pickle is the whole meal, and a very normal Japanese supper.
- As ochazuke. Put one in a bowl, pour hot green tea or dashi over it, and break it up. The crust softens into the broth and it’s genuinely one of the best things you can do with a leftover yaki onigiri.
- Alongside grilled fish or tebasaki wings if you’re building an izakaya-style spread at home.
Storing and Reheating
They keep in the fridge for a day or two, though the crust softens overnight. Reheat in the air fryer for three or four minutes at the same temperature and it comes back almost completely — this is one of the few things that genuinely reheats well.
They freeze very well, which is why the supermarket versions exist. Wrap each one individually once cooled, freeze, and cook from frozen in the air fryer at 200°C (390°F) for about 10 minutes. Don’t refrigerate plain cooked rice for more than a day before shaping — rice is one of the foods where reheating badly stored leftovers is a real risk, so cool it quickly and keep it cold.
Frequently Asked Questions
What sauce goes on yaki onigiri?
Soy sauce is the standard, usually with a little mirin for sweetness and gloss. Miso is the other classic, brushed on thickly and grilled until it chars slightly at the edges. Here I mix soy sauce, mirin, sesame oil, and dashi through the rice instead of brushing it on, which seasons the whole rice ball rather than just the surface.
Can you make yaki onigiri in an air fryer?
Yes, and it’s easier than the pan. Seven minutes at 230°C (450°F) on a grill setting gives a crisp crust on all sides with no flipping, no oil, and nothing sticking to the pan. The one requirement is a machine that reaches a high enough temperature — below about 200°C you get dry rice rather than a crust.
Do yaki onigiri have fillings?
Usually not. Unlike regular onigiri, which are built around a filling like salmon or umeboshi, yaki onigiri are normally plain so the seasoned crust is the star. You can add a filling if you like, but the frozen supermarket ones and the izakaya ones are almost always plain.
Why do my rice balls fall apart?
Three usual causes: the rice wasn’t short-grain, it was too cold to stick when you shaped it, or you didn’t press hard enough. Japanese short-grain rice is the only kind with enough surface starch to hold a shape. Shape it while warm, and pack it firmly.
Can I cook frozen yaki onigiri in an air fryer?
Yes — both homemade and the supermarket frozen ones. Cook from frozen at around 200°C (390°F) for about 10 minutes, straight from the freezer with no thawing. Thawing first makes them soggy.
What is yaki onigiri chazuke?
A grilled rice ball sitting in hot green tea or dashi broth, broken up with chopsticks as you eat. The toasted crust dissolves into the broth and gives it a nutty, savory flavor that plain ochazuke doesn’t have. It’s a common late-night order at izakaya, and the standard way to use up a yaki onigiri the next day.
Air Fryer Yaki Onigiri (Japanese Grilled Rice Balls)
Ingredients
Method
- Put the warm rice in a bowl. If using rice from the fridge, microwave it first – cold rice will not take the seasoning evenly or hold together when pressed.
- Add the soy sauce, mirin, sesame oil, dashi powder, and katsuobushi to the bowl. Fold everything through with a rice paddle, cutting through the rice rather than stirring, until the color is even with no pale patches.
- Pack the seasoned rice firmly into a triangular onigiri mold and press the lid down hard, or shape by hand with wet palms. Pack them tightly – loosely packed rice balls fall apart in the basket. Makes 4.
- Arrange them in the air fryer basket with space between them so the hot air reaches every side. No oil and no parchment paper.
- Cook on the grill setting at 230C (450F) for 7 minutes. Do not flip them and do not open the drawer to check. They are ready when the surface is golden with darker toasted patches on the edges.
- Lift them out with a spatula rather than tongs and let them sit for a minute before eating, so the crust firms up.
