Rinse sushi rice under cold water until water runs clear. Cook rice with water in a rice cooker.

In a bowl, combine diced tuna, mayonnaise, Sriracha, soy sauce, and sesame oil. Mix well.

Once rice is cooked, let it cool and then form into small squares. Heat oil in a frying pan and fry the rice squares until golden and crispy.

Top each crispy rice square with a spoonful of the tuna mixture. Garnish with green onions and sesame seeds.