Add the canned tuna and KEWPIE Mayonnaise to the bowl and mix.
Put half of the cooked rice in a rice bowl, make a hole in the middle of the rice and add half of 1.
Moisten your hands and sprinkle a little salt on your palms.
Transfer 2 to one hand and gently form into a ball while rolling in both hands. Make sure the filling is in the centre.
Make a triangle and wrap the ball with the yaki nori sheet cut in half.