11. 5 Napkin Burger

It may look like an old-fashioned butcher shop, but this upscale Back Bay spot offers every modern variation on the burger you could dream up—beef, tuna, turkey, lamb kofta, veggie—and all between great buns. End with a glorious espresso brownie sundae or a shake in the classic conical cup. 105 Huntington Ave., Prudential Center, Boston. 617-375-2277. www.5napkinburger.com