Spicy Tuna Mayo Onigiri Recipe

Spicy Tuna Mayo Onigiri is a flavorful Japanese rice ball filled with creamy, spicy tuna and wrapped in crispy nori. This easy-to-make snack is perfect for lunch, picnics, or meal prep. With its combination of seasoned sushi rice, umami-rich tuna filling, and crunchy seaweed, this onigiri is both delicious and satisfying.

Why You’ll Love This Recipe

• Easy to Make – Simple ingredients and quick assembly make this a great meal prep option.
• Flavorful and Spicy – The combination of Kewpie mayo, sriracha, and soy sauce creates a creamy, umami-packed filling.
• Perfect for Bento Boxes – These rice balls are portable, making them ideal for lunchboxes or snacks on the go.
• Customizable – Adjust the spice level, add veggies, or try different fillings to suit your taste.
• Authentic Japanese Snack – A classic favorite enjoyed in Japanese cuisine, great for those who love sushi flavors.

Ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

For the Rice:

• 2 cups sushi rice
• 2 ½ cups water
• 2 tbsp rice vinegar
• 1 tbsp sugar
• ½ tsp salt

For the Filling:

• 1 can (5 oz) tuna (drained)
• 3 tbsp Japanese mayonnaise (Kewpie)
• 1 tsp sriracha (adjust for spice preference)
• ½ tsp soy sauce
• ¼ cup finely diced cucumber (optional)

For Assembly:

• 4 sheets nori (seaweed)
• 1 tbsp furikake (Japanese rice seasoning)
• 1 tbsp sesame seeds (black & white mix)

Directions

1. Prepare the Rice: Rinse the sushi rice under cold water until the water runs clear. Cook with 2 ½ cups of water according to your rice cooker’s instructions or on the stovetop. Once cooked, mix in rice vinegar, sugar, and salt. Let cool slightly.
2. Make the Filling: In a bowl, mix drained tuna, Kewpie mayonnaise, sriracha, and soy sauce until well combined. Add finely diced cucumber for an extra crunch.
3. Shape the Onigiri: Wet your hands with water and sprinkle a little salt to prevent sticking. Take a handful of rice, flatten it in your palm, and place about 1 tablespoon of the spicy tuna mixture in the center. Cover with more rice and shape into a triangle or oval.
4. Wrap with Nori: Cut the nori sheets into strips and wrap them around the bottom of each onigiri.
5. Garnish & Serve: Sprinkle furikake and sesame seeds over the onigiri. Enjoy fresh or pack them for later.

Servings and Timing

• Servings: 4-6 onigiri
• Preparation Time: 20 minutes
• Cooking Time: 20 minutes
• Total Time: 40 minutes

Variations

• Extra Spicy: Add more sriracha or a dash of chili flakes for extra heat.
• Avocado Addition: Mix in mashed avocado for a creamier texture.
• Salmon Version: Swap the tuna for canned or cooked salmon.
• Vegetarian Option: Use mashed chickpeas or tofu mixed with mayo and sriracha as a plant-based alternative.
• Different Fillings: Try pickled plum (umeboshi), teriyaki chicken, or miso-seasoned tofu for variety.

Storage/Reheating

• Storage: Keep onigiri in an airtight container at room temperature for up to 6 hours, or refrigerate for up to 24 hours.
• Reheating: If refrigerated, warm in the microwave for 10-15 seconds to soften the rice before eating.
• Freezing: Not recommended, as the texture of the rice and nori may change.

FAQs

What is onigiri?

Onigiri is a Japanese rice ball, often shaped into triangles or ovals and filled with savory ingredients like tuna, salmon, or pickled plums.

Do I have to use sushi rice?

Yes, sushi rice is sticky and holds its shape well. Other rice varieties may not work as effectively.

Can I make onigiri ahead of time?

Yes! Onigiri can be stored in the fridge for up to 24 hours, but for the best texture, eat them fresh.

How do I keep the nori from getting soggy?

Wrap the nori separately and add it just before eating to keep it crisp.

What if I don’t have Kewpie mayo?

Regular mayonnaise can be used, but Kewpie mayo has a richer, slightly sweeter taste.

Can I make onigiri without a mold?

Yes! You can shape them by hand using slightly wet and salted hands to prevent sticking.

Is onigiri eaten hot or cold?

Onigiri is usually enjoyed at room temperature or slightly chilled.

Can I use flavored furikake seasoning?

Yes! Furikake with sesame, seaweed, or bonito flakes adds extra umami flavor.

What’s the best way to pack onigiri for lunch?

Wrap each onigiri in plastic wrap and keep it in an airtight container. If possible, store the nori separately to keep it crispy.

Can I add cheese to onigiri?

Yes! A small piece of cheese inside the filling melts slightly and adds a delicious twist.

Conclusion

Spicy Tuna Mayo Onigiri is a simple yet flavorful Japanese rice ball perfect for any occasion. With its creamy, spicy filling and satisfying texture, this onigiri is a must-try for sushi lovers and bento box fans alike. Whether for a quick lunch, picnic, or meal prep, these easy-to-make rice balls are sure to become a favorite!