Soak the dried seaweed in cold water for 10 minutes.
Soak the oatmeal in the measured amount of water for 5 minutes.
Finely chop the soaked seaweed.
Heat perilla oil in a pot and stir-fry the tuna.
Add the seaweed and stir-fry together.
Add the oatmeal and water, then simmer over medium-low heat for 5 minutes.
Season with salt and finish.