To create Spicy Tuna Crispy Rice, follow these easy steps:

1. Rinse the Sushi Rice: Rinse the sushi rice under cold water until the water runs clear to remove excess starch.
2. Cook the Rice: In a medium pot, combine the rinsed rice and water. Bring to a boil, then reduce the heat to low, cover, and simmer for about 20 minutes. Remove from heat and let it sit, covered, for another 10 minutes.
3. Prepare the Rice Seasoning: In a small bowl, mix the rice vinegar, granulated sugar, and salt until dissolved.
4. Season the Rice: Transfer the cooked rice to a large bowl. Gently fold in the vinegar mixture, being careful not to mush the rice.
5. Cool the Rice: Allow the seasoned rice to cool to room temperature.
6. Shape the Rice: Once cooled, take a small amount of rice and shape it into rectangular blocks, about 2 inches long and 1 inch wide. Repeat until all rice is shaped.
7. Fry the Rice: In a large skillet, heat vegetable oil over medium heat. Once hot, add the rice blocks in batches, frying until golden brown and crispy on all sides. Remove and drain on paper towels.
8. Make the Spicy Tuna Mixture: In a bowl, combine the diced tuna, mayonnaise, sriracha, green onion, sesame oil, and soy sauce. Stir until well mixed.
9. Assemble the Dish: Top each crispy rice block with a generous scoop of the spicy tuna mixture.
10. Garnish: Sprinkle with sesame seeds and garnish with nori strips. Optionally, add avocado slices on the side.

These steps will guide you in creating the incredible Spicy Tuna Crispy Rice effortlessly.