If you love sushi but want something easier to make, Tuna Mayo Onigirazu is the perfect recipe to try. Often described as a Japanese sushi sandwich, onigirazu combines seasoned rice, savory tuna mayo, fresh vegetables, and crisp nori in a neat, handheld package.
Unlike traditional sushi rolls, there is no special rolling technique involved. You simply layer everything over a sheet of nori, fold it around the filling, and slice it in half. The result is colorful, satisfying, and surprisingly easy to prepare.
The creamy tuna filling, soft seasoned rice, crunchy vegetables, and salty nori make every bite balanced and flavorful. It’s especially handy for lunch boxes, picnics, quick lunches, or make-ahead meals.
Ingredients
For the Rice
- 2 cups cooked Japanese short-grain rice
- 1 tablespoon rice vinegar
- 1 teaspoon sugar
- ¼ teaspoon salt
For the Tuna Mayo Filling
- 1 can tuna, about 5 oz, drained
- 2 tablespoons Japanese mayonnaise or regular mayonnaise
- 1 teaspoon soy sauce
- 1 teaspoon sesame oil
- 1 green onion, finely sliced
- ½ teaspoon Sriracha, optional
- Black pepper, to taste
For the Onigirazu
- 4 large sheets roasted nori
- ½ avocado, thinly sliced
- ½ cucumber, cut into thin strips
- 1 small carrot, cut into thin matchsticks
- Lettuce leaves
- Sesame seeds, optional
You can use all of the vegetables or choose just two or three depending on what you have available.
How to Make Tuna Mayo Onigirazu
1. Prepare the Sushi Rice
If you’re cooking the rice from scratch, rinse Japanese short-grain rice several times until the water runs mostly clear.
Cook according to the package instructions.
While the rice is still warm, mix the rice vinegar, sugar, and salt in a small bowl.
Pour the mixture over the rice and gently fold it through with a rice paddle or spatula.
Don’t mash the rice. The grains should remain soft and distinct while still sticking together.
Let the rice cool slightly before assembling the sandwiches.
2. Make the Tuna Mayo
Drain the tuna very well. Excess liquid can make the filling watery and difficult to assemble.
Place the tuna in a bowl and gently break it apart with a fork.
Add the mayonnaise, soy sauce, sesame oil, green onion, black pepper, and Sriracha if using.
Mix until creamy and well combined.
Taste the filling and adjust it to your preference. Add a little more mayonnaise for extra creaminess or Sriracha for more heat.
The tuna mixture should be creamy but thick enough to stay inside the onigirazu.
3. Set Up the Nori
Place a large sheet of nori on a clean cutting board or work surface.
Position it so that one corner points toward you, creating a diamond shape.
This makes folding the onigirazu easier.
If your nori feels especially dry or brittle, work gently because it can crack when folded.
4. Start Layering
Place a small amount of rice in the center of the nori, forming a rough square.
Don’t spread the rice all the way to the edges. Leave enough room around the sides to fold the nori over the filling.
Add a layer of tuna mayo over the rice.
Then add cucumber, carrot, avocado, and lettuce.
Finish with another layer of rice.
Try to keep the filling relatively compact and centered. A tall mound will make the sandwich difficult to close.
5. Fold the Onigirazu
This is the easiest part once you get the hang of it.
Take the bottom corner of the nori and fold it toward the center over the filling.
Then fold the top corner down.
Fold the left and right corners toward the middle as well, similar to wrapping a small parcel.
Press gently as you fold.
The moisture from the rice will help the nori soften and hold everything together.
If the nori doesn’t seem to stick, place the finished package seam-side down and let it sit for a minute.
6. Wrap and Slice
For a cleaner sandwich, wrap the onigirazu tightly in plastic wrap or parchment paper.
Let it rest for a few minutes.
Use a sharp knife to cut it directly in half.
Wipe the knife with a damp cloth between cuts if necessary. This helps create a clean cross-section without pulling apart the rice and filling.
When sliced, you should see neat layers of rice, creamy tuna, colorful vegetables, and nori.
Tips for Making the Best Onigirazu
Use short-grain rice. Japanese short-grain rice is naturally sticky and holds the sandwich together much better than long-grain rice.
Drain the tuna thoroughly. Extra liquid can make the filling loose and cause the nori to become soggy.
Don’t overfill it. It can be tempting to add lots of filling, but an overly packed onigirazu is difficult to fold and eat.
Keep the layers even. Even layers create a cleaner cross-section and make every bite more balanced.
Use fresh nori. Crisp, good-quality nori gives the sandwich a much better texture and flavor.
Let it rest before cutting. A few minutes allows the nori and rice to settle around the filling.
Use a sharp knife. A clean cut makes the colorful layers much more attractive.
Easy Variations
Spicy Tuna Mayo Onigirazu
Add extra Sriracha or a little chili crisp to the tuna mixture. Add sliced jalapeño if you want even more heat.
Tuna Avocado Onigirazu
Keep things simple with tuna mayo, avocado, cucumber, and rice. The creamy avocado works especially well with the savory tuna.
Tuna Egg Onigirazu
Add a thin layer of sliced omelet or hard-boiled egg for extra protein and richness.
Tuna Corn Onigirazu
Mix sweet corn into the tuna mayo. The sweetness adds a nice contrast to the salty soy sauce and nori.
Teriyaki Tuna Onigirazu
Add a small drizzle of teriyaki sauce to the tuna mixture for a sweeter, deeper flavor.
Vegetable Onigirazu
For a lighter version, add more cucumber, lettuce, carrots, spinach, or avocado and reduce the amount of tuna.
What Makes Onigirazu Different From Sushi?
Traditional sushi rolls require the rice and filling to be rolled tightly inside nori.
Onigirazu is much simpler.
Instead of rolling, you layer the ingredients and fold the nori around them like a sandwich.
This makes it easier to prepare, especially if you’re new to making sushi at home.
The sandwich-style shape also makes onigirazu convenient to pack and carry.
What to Serve With Tuna Mayo Onigirazu
Tuna mayo onigirazu can easily be a complete lunch on its own, but it also pairs well with simple Japanese-inspired sides.
Try serving it with:
- Miso soup
- Edamame
- Japanese cucumber salad
- Pickled ginger
- Seaweed salad
- Fresh fruit
- Steamed vegetables
For a lunch box, add a few slices of fruit or a small salad alongside the onigirazu.
Make-Ahead and Storage
Onigirazu is best eaten relatively soon after assembling because the nori gradually softens from the moisture in the rice and filling.
If you’re preparing it for lunch, wrap each sandwich tightly in plastic wrap or parchment paper and refrigerate it.
For the best texture, prepare it the same day you plan to eat it.
If refrigerated, allow it to sit at room temperature for a short time before eating so the rice isn’t overly firm.
Because the filling contains tuna and mayonnaise, keep it properly refrigerated and avoid leaving it at room temperature for extended periods.
Recipe at a Glance
| Detail | Information |
|---|---|
| Prep Time | 15 minutes |
| Cook Time | 20 minutes, if cooking rice |
| Assembly Time | 10 minutes |
| Total Time | About 35–45 minutes |
| Servings | 4 |
| Difficulty | Easy |
| Category | Lunch / Snack |
| Cuisine | Japanese |
Nutrition Facts
Approximate values per serving, based on four onigirazu and including the listed tuna, rice, and vegetables.
| Nutrient | Approx. Amount |
|---|---|
| Calories | 390 kcal |
| Protein | 18 g |
| Carbohydrates | 48 g |
| Fat | 15 g |
| Saturated Fat | 2.5 g |
| Fiber | 3 g |
| Sugar | 3 g |
| Sodium | 620 mg |
Nutrition information is an estimate and can vary depending on the tuna, mayonnaise, rice, and fillings used.
Final Thoughts
Tuna Mayo Onigirazu is one of those recipes that looks impressive once sliced but is surprisingly simple to make. You don’t need a sushi mat, special rolling skills, or complicated ingredients. Just layer seasoned rice, creamy tuna mayo, fresh vegetables, and nori, then fold everything into a neat little sandwich.
The combination of savory tuna, creamy mayonnaise, crisp vegetables, sticky rice, and roasted nori makes it satisfying without feeling overly heavy.
Once you’ve mastered the basic technique, you can change the fillings to suit whatever you have in the refrigerator. That’s what makes Tuna Mayo Onigirazu such a practical recipe—it feels like sushi, eats like a sandwich, and works beautifully for an easy homemade lunch.