Lunch hour and daily plates
Portuguese take their time frames seriously when it comes to eating (and especially then;)! Lunch hour is from 12:00 to 14:30. On weekdays you will be able to choose between two or more daily plates in most places. They are usually much cheaper and come as a whole menu including a drink, coffee and a dessert if you wish (usually there is a price offered with and without dessert).
For all the fish-lovers
Monday is no fish day! Since Sunday is the day of the lord, the fishermen don’t go out in their boats, but rest at home with their families. Hence it’s a good sign if a restaurant doesn’t offer fish on Monday: it means that they probably have fresh fish every day!
No fish in a sea food restaurant?
A seafood restaurant in Portugal does not necessarily offer grilled fish. Portuguese usually eat grilled fish at a place specialized in BBQing fish. In seafood restaurants on the other hand, you will find a big variety of shellfish and such and probably some of the delicious Portuguese fish stews like Cataplana and Feijoada.