1: Combine cooked rice with furikake in a mixing bowl. Set aside.
2: In a separate bowl, add drained tuna, mayo, sesame oil, furikake, and sriracha. Combine well and set aside.
3: Using the onigiri mold, fill half the mold with rice. Add a thin layer of the spicy tuna mixture. Then add more rice to fill the mold. Using the cap of the mold, press to form the onigiri triangle ball.
4: Remove the rice ball from the mold by pressing on the bottom end of the mold for the rice ball to fall out.
5: Wrap the bottom of the triangle rice ball with a piece of the sliced nori.
6: Continue the process from step 3-5 until all rice and tuna mix is used.
7: Enjoy as it's being made or save for a snack later.
