Creating this amazing dish is a joy when you follow these simple steps:

1. Prepare the Sushi Rice: Rinse the sushi rice under cold water until the water runs clear. Drain well.
2. Cook the Rice: In a medium pot, combine the sushi rice and water. Bring to a boil, then cover and reduce heat to low. Cook for 15-20 minutes until the water is absorbed. Once done, let it sit for 10 minutes.
3. Season the Rice: In a small bowl, mix the rice vinegar, sugar, and salt until dissolved. Pour this mixture over the warm rice, and gently fold it together. Allow it to cool.
4. Make the Spicy Tuna: In a bowl, combine the diced tuna, mayo, sriracha, and sesame oil. Mix well to ensure every piece is coated. Taste and adjust the spiciness according to your preference.
5. Shape the Rice: Once the rice has cooled, form it into small rectangular or square rice cubes, about 1-2 inches in size, with damp hands to prevent sticking.
6. Fry the Rice: In a large skillet, heat oil over medium-high heat. Carefully add the rice cubes in batches, frying until golden and crispy on all sides (about 2-3 minutes per side). Drain on paper towels.
7. Assemble the Dish: Top each crispy rice cube with a generous scoop of the spicy tuna mixture.
8. Garnish: Place slices of avocado on top if using. Sprinkle with chopped green onions and sesame seeds for added flavor and visual appeal.

Following these steps will help you create an incredible Spicy Tuna Crispy Rice that tastes as good as it looks!