Drain the oil from the canned tuna and set aside.
In a bowl, mix tuna, mayonnaise, chopped onion, chopped pickles, and BBQ sauce.
Add salt and sesame oil to the rice and mix evenly.
Shape the seasoned rice into round rice balls.
Place the BBQ tuna filling in the center of each rice ball and wrap the rice around it.
Wrap the rice balls with seaweed.
Plate and serve.