Clean the tuna and seaweed thoroughly.
Drain the tuna and soak the seaweed, then cut it into bite-sized pieces.
Add sesame oil to a pot and stir-fry the seaweed and tuna.
Add the rice and stir-fry for another 2-3 minutes.
Pour in water and bring to a boil.
Simmer over medium heat, stirring occasionally, until the porridge thickens.
Season with salt, let it boil a little longer, and then serve in a bowl.