Wash your hands well beforehand. Make sure the cooked rice is warm but not too hot.
Sprinkle 2 pinches of salt on the rice, and give it a gentle mix.
[A] Put half of the rice on the center of the foil (or your hand).
[B] Make a dent (NOT a hole!) in the center of the rice. Place your marinated egg/avocado/tempeh in the dent.
[C] Gently cover the centered ingredient with rice, making everything into a round-shaped ball.
[D] Finally, wrap the ball up with nori.
Repeat [A-D} with the another ball. Serve, and enjoy!