Finely chop the kimchi and green onion.
Drain the oil from the canned tuna using a strainer.
Heat sesame oil in a pot and stir-fry the kimchi and green onion.
Add the tuna and stir-fry together.
Add rinsed rice (or oats) and continue stir-frying.
Pour in water and simmer over medium-low heat.
When the porridge thickens, season with salt.
Serve in a bowl and finish with sesame oil or seaweed flakes.