Drain the oil from the tuna using a sieve.
Crack the eggs, add a pinch of salt, and beat them well.
Pour some oil into a pan, add the beaten eggs, and make scrambled eggs.
Add the drained tuna to the scrambled eggs and mix well.
Finely chop the cartilage (crunchy bone) and stir-fry it together with the eggs and tuna.
Taste and adjust seasoning, then serve on a plate.