Soak the seaweed in cold water.
Drain the oil from the tuna using a sieve.
Soak the oatmeal in water for 10 minutes.
Add sesame oil to a pot and stir-fry the seaweed.
Add the tuna and stir-fry together.
Add the soaked oatmeal and water, stirring while bringing to a boil.
Season with salt.
Finish when the porridge becomes thick.