Soak oatmeal in water for 10 minutes.
Finely chop the onion and carrot.
Add sesame oil to a pan and sauté the onion and carrot.
Add tuna and stir-fry together.
Add the soaked oatmeal and water, and bring to a boil.
Simmer over medium-low heat while stirring for 7-10 minutes.
Season with salt to taste.