Soak the seaweed in cold water and chop it finely.
Prepare the oatmeal.
Beat the egg in a bowl.
Pour water into a pot and add the seaweed. Bring to a boil.
Once the seaweed becomes tender, add oatmeal and stir while boiling.
When the oatmeal expands, pour in the beaten egg and stir.
Season with salt to taste and serve the finished porridge in a bowl.