1. Rinse the sushi rice under cold water until the water runs clear. This step is key to removing excess starch and achieving that perfect sticky texture.
2. Combine the rinsed rice and 2 ½ cups water in a rice cooker or pot. Cook according to your rice cooker’s instructions or bring to a boil, then simmer covered for 18 minutes on low heat if cooking on the stove.
3. While the rice cooks, mix the rice vinegar, sugar, and salt in a small bowl until the sugar dissolves. Once the rice is done, transfer to a large bowl and gently fold in the vinegar mixture. Spread the rice out to cool to room temperature—this also helps the rice dry slightly so it crisps better.
4. Heat a non-stick skillet over medium heat and add vegetable oil. Once hot, press the rice into small rectangular or square molds (about 2 inches by 3 inches) or shape with your hands. Fry the rice pieces until golden and crispy on both sides, about 3-4 minutes per side. Drain on paper towels.
5. In a bowl, combine diced tuna, mayonnaise, sriracha, soy sauce, sesame oil, and green onions. Taste and adjust the spice or seasoning as you like. This spicy tuna mixture is where the magic happens—it’s creamy, spicy, and packed with umami.
6. Top each crispy rice piece generously with the spicy tuna mixture. Sprinkle with toasted sesame seeds for a little crunch and extra flavor.
7. Serve immediately with pickled ginger and wasabi on the side, if desired. The contrast between the spicy, creamy tuna and the crisp rice is even better when accompanied by these traditional sushi condiments.

One tip I learned from my grandmother’s kitchen is to not overcrowd the pan while frying the rice—give each piece space to crisp up beautifully. Also, don’t skip the cooling step for the rice; it really helps achieve that perfect crunch that makes this dish so memorable.