Cut the avocados in half lengthwise and remove the pits. Scoop out a small amount of the avocado flesh from each half to create a larger cavity for the tuna mixture.
In a bowl, mix together the tuna, mayonnaise, Sriracha sauce, soy sauce, sesame oil, and green onion. Season with salt and pepper to taste.
Spoon the tuna mixture into the avocado halves, filling them to the top.
Optional: sprinkle sesame seeds over the top of each avocado half for garnish.
Serve immediately
Enjoy!