Prepare and clean the eel.
Rinse the rice thoroughly and soak for 30 minutes.
Add the soaked rice, water, soy sauce, mirin, and sugar into the pot.
Cut the cleaned eel into appropriate pieces.
Place the eel pieces on top of the rice mixture in the pot.
Cook the rice over medium-low heat for 15 minutes.
Let it steam for about 10 minutes.
Finish by topping with green onions and sesame seeds.