Conga makes one of the best bifanas (pork sandwiches) in Oporto. You should also try the Hot Dog's and Prego's (cow sandwiches), they all have Conga's special sauce at a very affordable price. For the people who really want to try traditional food, order Papas de Sarrabulho (different sausages cooked with blood of different animals). It's really tasty besides what you may think.