Life Made Useful

Crispy Sushi Rice Squares with Spicy Tuna

Recipe Overview

These crispy sushi rice squares turn seasoned sushi rice into crunchy, pan-fried bites topped with creamy spicy tuna or avocado. First, sushi rice is cooked and seasoned with rice vinegar, then pressed firmly into a pan and chilled until fully set. Then, the firm rice is cut into squares and pan-fried until deeply golden and crispy on the outside while staying soft in the center. In addition, a quick spicy mayo-based tuna topping, or a simple avocado topping, adds creamy contrast to the crunchy rice base. Because the rice needs time to firm up before frying, a little planning ahead makes all the difference for that perfect crispy texture. As a result, you get restaurant-style crispy rice bites made entirely at home.

This recipe is especially useful for appetizers at parties, date-night dinners, or as a fun, hands-on meal to make with family or friends.

Why You’ll Love This Recipe

  • Crispy on the outside, soft and chewy on the inside
  • Restaurant-style appetizer made completely at home
  • No special sushi-rolling skills required
  • Easily customizable with different toppings
  • Great for entertaining or a fun dinner at home
  • Naturally gluten-free when using tamari instead of soy sauce
  • Make-ahead friendly, since the rice needs to chill anyway

Ingredients You’ll Need

  • 2 cups sushi rice, uncooked
  • 2 1/4 cups water
  • 1/4 cup rice vinegar
  • 1 tablespoon granulated sugar
  • 1 teaspoon salt
  • 3 tablespoons vegetable oil, for frying
  • 8 ounces sushi-grade tuna, finely diced
  • 1/4 cup mayonnaise
  • 1 tablespoon sriracha, plus more to taste
  • 1 teaspoon soy sauce
  • 1 teaspoon sesame oil
  • 1 avocado, thinly sliced, optional topping
  • 1 green onion, thinly sliced, for garnish
  • 1 tablespoon toasted sesame seeds, for garnish
  • Soy sauce, for serving

Step-by-Step Instructions

  1. Rinse the sushi rice under cold water until the water runs mostly clear, about 2 to 3 minutes. Drain well.
  2. Combine the rinsed rice and water in a rice cooker or medium saucepan. If using a saucepan, bring to a boil, then reduce the heat to low, cover, and simmer for 18 to 20 minutes, until the water is absorbed.
  3. While the rice cooks, whisk together the rice vinegar, sugar, and salt in a small bowl until the sugar and salt dissolve.
  4. Once the rice is done cooking, transfer it to a large bowl. Pour the vinegar mixture over the warm rice and gently fold it in with a spatula until evenly coated. Let the rice cool for 10 minutes.
  5. Line an 8×8-inch baking dish with parchment paper. Transfer the seasoned rice to the dish and press it down firmly and evenly using a spatula or the back of a measuring cup, packing it as tightly as possible.
  6. Cover and refrigerate the rice for at least 2 hours, or until fully firm and cold.
  7. While the rice chills, make the spicy tuna by combining the diced tuna, mayonnaise, sriracha, soy sauce, and sesame oil in a bowl. Stir well and refrigerate until ready to use.
  8. Once the rice is firm, lift it out of the dish using the parchment paper and place it on a cutting board. Cut into 12 to 16 even squares.
  9. Heat 1 1/2 tablespoons of the vegetable oil in a large nonstick skillet over medium heat. Working in batches, fry the rice squares for 3 to 4 minutes per side, until deeply golden and crispy. Add the remaining oil as needed between batches.
  10. Transfer the crispy rice squares to a plate. Top each square with a spoonful of the spicy tuna mixture or a slice of avocado.
  11. Garnish with sliced green onion and toasted sesame seeds. Serve immediately with soy sauce on the side for dipping.

Helpful Tips

  • Rinse the rice thoroughly before cooking to remove excess starch, which helps it cook up fluffy rather than gummy.
  • Press the rice down as firmly as possible in the pan, since this is what allows it to hold together while frying.
  • Don’t skip the chilling step, since warm or soft rice will fall apart when you try to fry it.
  • Use sushi-grade tuna from a trusted source, since the tuna topping is served raw.
  • Fry the rice squares in a single layer without overcrowding the pan so each one gets evenly crispy.
  • Use a nonstick or well-seasoned skillet to help the rice release easily without sticking.
  • Serve these immediately after frying, since they’re best enjoyed while the outside is still hot and crispy.

Recipe Variations

  • Make it spicier: Add extra sriracha to the tuna mixture or drizzle spicy mayo over the top before serving.
  • Make it lighter: Skip frying and instead serve the rice squares cold, straight from the pan, similar to a classic sushi cube.
  • Add vegetables: Top with thinly sliced cucumber or pickled ginger for extra freshness.
  • Use a different protein: Substitute cooked shrimp, cooked salmon, or imitation crab for the raw tuna if preferred.
  • Make it dairy-free: This recipe is naturally dairy-free as written, so no changes are needed.
  • Use a substitute: If sushi-grade tuna isn’t available, use canned tuna mixed with mayonnaise and sriracha for a cooked alternative.
  • Make it vegetarian: Top the crispy rice with avocado, pickled vegetables, or a drizzle of spicy mayo instead of tuna.

What to Serve with This Recipe

Since these crispy rice squares are rich and satisfying as an appetizer, they pair well with a light miso soup or a simple cucumber salad. Edamame also makes a great, easy side that complements the flavors without competing with them.

If you’re serving these as part of a larger meal, they pair nicely with other Japanese-inspired dishes, such as a simple stir-fry or teriyaki chicken, for a fun at-home sushi night.

Frequently Asked Questions

Can I use a different type of rice? Sushi rice is recommended for this recipe because of its sticky texture, which helps the squares hold together. Other short-grain rice varieties can work, but the texture may be slightly different.

Can I make this without raw tuna? Yes. Use cooked shrimp, cooked salmon, imitation crab, or simply top the crispy rice with avocado for a fully cooked or vegetarian version.

How far ahead can I prepare the rice? The seasoned rice can be pressed into the pan and refrigerated up to 3 days in advance, making this a great make-ahead appetizer for parties.

Can I bake the rice squares instead of frying them? Yes, though the texture won’t be quite as crispy. Bake at 425°F on a well-oiled baking sheet for about 20 minutes, flipping halfway through.

Do I need a rice cooker to make this recipe? No. A rice cooker makes the process easier, but sushi rice can also be cooked on the stovetop using the method described in the instructions.

Can I use sushi-grade salmon instead of tuna? Yes. Sushi-grade salmon works well as a substitute and can be prepared the same way as the tuna topping.

Why did my rice squares fall apart while frying? This usually happens if the rice wasn’t pressed firmly enough or wasn’t chilled long enough. Make sure to pack the rice tightly and refrigerate for the full 2 hours before cutting and frying.

Recipe Card

  • Prep Time: 20 minutes
  • Cook Time: 20 minutes
  • Rest Time: 2 hours
  • Total Time: 2 hours 40 minutes
  • Servings: 12 to 16 pieces

Ingredients

  • 2 cups sushi rice, uncooked
  • 2 1/4 cups water
  • 1/4 cup rice vinegar
  • 1 tablespoon granulated sugar
  • 1 teaspoon salt
  • 3 tablespoons vegetable oil, for frying
  • 8 ounces sushi-grade tuna, finely diced
  • 1/4 cup mayonnaise
  • 1 tablespoon sriracha, plus more to taste
  • 1 teaspoon soy sauce
  • 1 teaspoon sesame oil
  • 1 avocado, thinly sliced, optional topping
  • 1 green onion, thinly sliced, for garnish
  • 1 tablespoon toasted sesame seeds, for garnish
  • Soy sauce, for serving

Instructions

  1. Rinse and cook the sushi rice, then season with a mixture of rice vinegar, sugar, and salt.
  2. Press the seasoned rice firmly into a parchment-lined 8×8-inch dish. Refrigerate at least 2 hours, until firm.
  3. Mix diced tuna with mayonnaise, sriracha, soy sauce, and sesame oil; refrigerate until ready to use.
  4. Cut the chilled rice into 12 to 16 squares.
  5. Fry the squares in batches in vegetable oil over medium heat, 3 to 4 minutes per side, until golden and crispy.
  6. Top with spicy tuna or avocado, garnish with green onion and sesame seeds, and serve immediately with soy sauce.

Storage: Store unfried rice and tuna mixture separately in airtight containers in the refrigerator for up to 3 days. Fry fresh for best texture; reheat leftover fried squares in a skillet for 2 to 3 minutes per side.