Season your tuna generously with salt on all sides. In a pot, over medium high heat, add your oil and bring to 150f. Add your tuna fillet and cook for 20-25 minutes or until internal temperature reaches 145f. Then remove and let cool. Then to a bowl, add your cooked and cooled tuna fillet. Using a fork, mix and mash your tuna until broken into small pieces. Next, add your green onion, ginger, mayo, sriracha, sesame oil and salt. Mix thoroughly and set aside. Using wet hands, form your sushi rice around a spoonful of your tuna filling. Then, in a frying pan, over medium high heat, add your Onigiri and cook for 3 minutes. Flip, brush with soy sauce and cook for another 3 minutes. Flip again brush with soy sauce and remove from pan. Wrap a slice of Nori sheet around your Onigiri and enjoy!
