Probably the best “erster” joint in the city, Casamento’s takes its oysters so seriously that it simply closes down when they’re not in peak season (well, Gulf oysters are always in season nowadays, but everyone needs a vacation). The subway-tiled restaurant has been family-owned since 1919. The oysters are scrubbed clean and well selected; the shucker is a hoot (if you dare him, he’ll shoot a bivalve into your mouth from across the room). You should absolutely take the plunge and order the oyster loaf: a whole loaf of bread fried in butter, filled with oysters (or shrimp), and fried again to seal it. Seriously.