Wash the rice and soak in water for half to 1 hour.
Boil water in a saucepan. Add rice and cook till the grains are soft. Drain the cooked rice and let them cook for 10 to 15 minutes.
Cut the pre-toasted nori sheets crosswise.
Grill the salmon and break up into small pieces with the help of a fork.
Prepare the filling for the rice balls. Mix the bonito flakes with soy sauce in a bowl. Add the chopped pickled plums and crushed cashews. Mix them well.
Wet your hands prior to making the balls in order to avoid the rice sticking to your hands. Take a handful of rice, make a hollow in the center and place a spoonful of the prepared filling. Close the rice around the filling and form a triangular shape. Cover the corner of the triangle with nori sheet.
Sprinkle sesame seeds over the prepared triangles.
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