Spicy Tuna Onigirazu (Japanese Sushi Sandwich)
A Japanese sushi sandwich sounds fancy, but it is actually one of the quickest lunches you can put together.
Onigirazu is a handheld rice package wrapped in nori, loaded with spicy tuna, creamy avocado, and crisp vegetables. No rolling mat, no fuss.
Why This Rice Sandwich Works
The spicy tuna filling is bold but balanced by cool avocado and crunchy cucumber. Every bite gives you fluffy rice, salty nori, and a creamy kick.
It is the kind of lunch that feels put together without any real cooking. Because the fillings are sealed inside, you get all the texture in one neat package.
Ingredients
- 2 cups cooked sushi rice, seasoned: cool completely; warm rice will not hold its shape.
- 2 large nori sheets: the type used for sushi rolls.
- 1 (5 oz) can tuna, drained: solid or chunk light tuna.
- 2 tbsp mayonnaise: full-fat or Japanese Kewpie mayo.
- 1 tsp sriracha: add more for extra heat.
- 1 tsp soy sauce: tamari works too.
- ½ tsp sesame oil: for a subtle nutty flavor.
- ½ avocado, sliced: ripe but firm.
- ¼ English cucumber, thinly sliced: no need to peel.
- 4 butter lettuce leaves: or green leaf lettuce.
- Small bowl of water: for sealing the nori and keeping fingers damp.
Variations / Substitutions
- Protein: swap tuna for cooked shredded chicken, canned salmon, or marinated tofu for a vegetarian version.
- Extra crunch: add a few strips of pickled daikon radish or a sprinkle of furikake on the rice.
- Heat level: dial the sriracha up or down, or swap it for a spoonful of gochujang.
- Greens: use shiso leaves, baby spinach, or romaine if you do not have butter lettuce.
A closely related recipe I often make is a Teriyaki Salmon Rice Bowl, which uses the same seasoned rice and fresh toppings.
How To Make Spicy Tuna Onigirazu
Step 1: Mix the Spicy Tuna Filling
In a small bowl, combine the drained tuna with 2 tbsp mayonnaise, 1 tsp sriracha, 1 tsp soy sauce, and ½ tsp sesame oil. Stir until everything is evenly mixed and the tuna breaks down into a spreadable paste. Taste it and add more sriracha if you want a stronger kick. Set the bowl aside while you set up the nori.
Step 2: Layer the Rice and Fillings
Lay a sheet of nori shiny side down on a piece of plastic wrap, with one corner pointing toward you. Wet your hands with the bowl of water so the rice does not stick. Take about ½ cup of the cold seasoned rice and place it in the center of the nori. Use your damp fingers to press it into a flat square shape, roughly the size of a deck of cards. Spoon a generous half of the spicy tuna onto the rice, then top with a few slices of avocado, cucumber, and a lettuce leaf folded to fit. Finish with another ½ cup of rice, pressing it gently into a matching square so the fillings are sealed inside.
Step 3: Wrap and Slice the Onigirazu
Fold the bottom corner of the nori up and over the rice pile, then the left and right corners, and finally the top corner, tucking it tightly like an envelope. Dab a little water on the last corner to seal it shut. Wrap the whole sandwich snugly in the plastic wrap, press it lightly, and let it sit for 5 minutes. That rest time lets the nori soften just enough to slice cleanly. Unwrap, then cut straight down the middle with a sharp serrated knife to reveal the colorful layers. Serve right away.
Tips for the Best Onigirazu
- Cold rice is key: warm or freshly cooked rice will be too sticky and collapse; make sure it has chilled for at least 30 minutes before you start.
- Work quickly once the nori is out: it absorbs moisture from the air and loses its snap, so have all your fillings ready.
- Do not overfill: a heaping rice square and a modest filling layer hold together much better than a stuffed one that bursts.
This recipe makes 2 sandwiches; scale it up easily for a crowd.
| Sandwiches | Sushi Rice | Canned Tuna | Nori Sheets |
|---|---|---|---|
| 2 | 2 cups | 1 (5 oz) can | 2 |
| 4 | 4 cups | 2 (5 oz) cans | 4 |
| 6 | 6 cups | 3 (5 oz) cans | 6 |
Keeping Onigirazu Fresh
Assemble the sandwiches a couple of hours ahead and keep them wrapped in plastic in the fridge. The nori will gradually soften, so they are best eaten within 4 hours. Do not freeze them; the rice turns hard and the vegetables become watery.
What To Serve With Onigirazu
Pair these hand rolls with a warm cup of instant miso soup and a handful of steamed edamame tossed with salt. Both come together in minutes and round out the meal without adding any heavy flavors. A quick pickled cucumber salad with rice vinegar and a pinch of sugar also cuts through the richness of the spicy tuna.
Frequently Asked Questions
Can I use brown rice instead of sushi rice?
Yes, but short-grain brown rice works best because it gets sticky when cooked. Press the layers firmly so the grains cling together.
How do I keep the nori from getting soggy?
Assemble the onigirazu just before eating, and make sure the rice is cool and not wet. If you need to make them ahead, keep them tightly wrapped in plastic; the nori will soften but not fall apart.
Can I use fresh raw tuna?
Absolutely. Chop 4 oz of sushi-grade tuna finely, then mix it with the mayo, sriracha, and soy sauce. Follow the same layering method.
Do I need a special tool?
No. A square of plastic wrap and your hands do all the shaping. Some people use an onigirazu mold, but it is optional.
Spicy Tuna Onigirazu Recipe
Ingredients
Method
- In a bowl, mix the tuna, mayonnaise, sriracha, soy sauce, and sesame oil until well combined.
- Place a nori sheet on plastic wrap, shiny side down. Wet your hands, place ½ cup rice in the center, and press it into a square. Add half the tuna mixture, avocado, cucumber, and lettuce. Top with another ½ cup rice, pressing it into a square.
- Fold the nori corners over the rice like an envelope, seal with water, and wrap tightly in plastic wrap. Let it rest 5 minutes, then slice in half with a serrated knife. Serve immediately.
