01.  Cook the potatoes in salted water until tender. Peel and slice them.

02.  In a large skillet, heat olive oil and sauté the chopped onions and garlic until golden.

03.  Add the shredded cod and cook for a few minutes.

04.  In an ovenproof dish, create alternating layers of cod, potatoes, and onions, finishing with a layer of potatoes.

05.  Drizzle with olive oil and bake at 180°C for about 20 minutes.

06.  Serve sprinkled with chopped parsley and decorate with hard-boiled eggs, if desired.