I've eaten at Sagres so many times, I couldn't even begin to count, but it never gets boring.
If you're not familiar with Portuguese food... I feel sorry for you. Go to Sagres. Everything they do is delicious but in particular, its the fish dishes that stand out. The rice pilaf and fried potatos that come with most mains are very filling, but absolutely great.. you might not even realise how good they are until you've taken home leftovers and tried them the next day. The pork and clams are one of their more traditional offerings, and should not be missed. If this combination sounds strange to you, just buck up and try it, it'll be one of the most unique and flavourful things you'll ever eat, while at the same time, staying very simple and rustic.
On some days Santos has real ling cod, or red snapper on special. If he mentions "fresh cod" or snapper as a special of the day, order it. The sauce for the cod is a spicy and tangy dressing with piri piri, white wine, sauteed onions, stewed tomatos and butter. The fish itself is lightly dredged in seasoned flower and pan fried after marinating in some kind of magic liquid. When combined, these two things which are already great on their own, become even more special, and he uses only the freshest, best quality fish.
If none of this has convinced you to try this place, then consider the value. The portion sizes from the lunch menu would be generous for dinner at any other restaurant you've been to, and they range from about $10 to $14. The dinner menu ranges from about $15 to $25, and these enormous piles of perfection don't fit on normal dinner plates. Be prepared to be fed.