Add the tuna, 3 tbsp Kewpie mayo, 1 ½ tbsp Sriracha, 1 ½ tsps Sesame oil, ½ tbsp Soy sauce, 1 dash Black pepper, and 1 tsp Sesame seeds in a bowl and mix well.
Add ⅓ cup chopped green onion and 2 ½ cups cooked jasmine rice and mix to combine.
Transfer the mixture to a baking dish and top with 1 ½ tbsp Kewpie mayo and 1 ½ tbsp Sriracha.
Broil until the top is lightly browned.
Finish with ½ tbsp Nori komi furikake rice seasoning and the remaining green onions.
Serve with thinly sliced cucumber.
