Soak the dried seaweed in cold water, then drain thoroughly.
Place the tuna in a strainer to remove the oil.
Heat sesame oil in a pot and lightly sauté the seaweed.
Add the tuna and stir-fry together.
Pour in water and add the cooked rice, then bring to a boil.
Simmer on low heat, stirring occasionally, until the rice is fully cooked and softened.
Season with salt.