Portugal is a Catholic country and the Easter is an important religious festive season. As on all festive seasons and special celebrations, there is always a typical menu to celebrate the date.
The Good Friday prior to Easter is always celebrated with fish dishes as according to the Catholic principles you should not eat meat as it is related with the blood Christ shed to save us, so by avoiding this food you would be compassion with his suffer specially on the day of his death. So in Portugal when you mentioned fish, the first variety that come up is cod. So it is the most popular portuguese plate to eaten on Good Friday.
On Easter Sunday the tradition is different and the meat is the most popular food on this date due to the meat absence during the Lent season.
The roasted lamb or kid are the most popular meats eaten on this day with roasted potatoes.
But the desserts are probably the most distinguished for this season and the “Folar” is the major sweet of the season. It is a sweet bread that comes with a boiled egg in the middle, which represents the rebirth of Christ. However there are many variations of this bread and for instance in the Algarve region they do not include the egg on the bread and the bread is much sweeter.
So if you are planning to visit Portugal on this season, try to eat the specialities of this season, “When in Rome, do as Romans do”.