Rinse the rice thoroughly and soak for 30 minutes.
Drain the tuna in a sieve to remove the oil.
In a pot, add the tuna and soaked rice and stir-fry.
Pour in water and boil over medium heat.
Stir occasionally and cook until it reaches a porridge consistency.
Season with salt to taste.
Serve in a bowl and garnish with chopped green onions.