Potatoes with cod in Bechamel sauce

There are several ways to prepare potatoes with cod.
It is said that the Portuguese have 365 recipes for cooking cod;
one for each day of the year.
Let's make a delicious dish where cod is combined with fried potatoes, onions, and a rich Bechamel sauce.
Recipes vary, as with any others, it's difficult to find cooks
who prepare them the same way.
This recipe is just one option among many,
and it's my favorite way to cook cod!