You say snails, they (as the French) say escargot. But in Portugal these are considered an everyday snack since they are so inexpensive and readily available. Should you come across a source of snail, say at a gourmet grocer or a Portuguese food market, snatch them up and use them to prepare this authentic dish. Just be sure to give the snails a good washing in several changes of water until you no longer see any grit. Serve them warm with crusty bread and a cold one.