Pull up a chair at the counter of Swan Oyster Depot and enjoy some of the best Boston Clam Chowder you will ever taste. Besides Clam Chowder, most of the offerings on the menu board are served raw, cocktail-style. The Depot is also a fish market. You can buy a filet to cook up at home. The atmosphere is completely informal. Reservations are not accepted, but it is worth the wait.