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 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.