Prepare oatmeal, tuna, eggs, and onion.
Finely chop the onion.
Add water and onion to a pot and bring to a boil.
Add the oatmeal and stir over low heat.
Add tuna (drained of oil) and mix well.
Beat the eggs and slowly pour them in while stirring.
Season with salt and simmer briefly.
Serve in a bowl to finish.