Prepare oatmeal, seaweed, and tuna.
Soak dried seaweed in water, then drain the water.
Add oatmeal to a pan and lightly toast it over low heat.
Add 200ml of water to the toasted oatmeal and bring to a boil.
When the oatmeal porridge starts boiling, add seaweed and tuna and cook for another 3 minutes.
Season with salt and serve in a bowl.