Katz's Delicatessen New York has the best Maztoh ball soup I've ever eaten. Dumplings the size of your fist. Mmm, brains. It's also the location of 'that scene' in When Harry Met Sally. And Carnegie Deli has the biggest sandwich I've ever eaten ' The Woody Allen', which is alternated pastrami and corn beef in a bowl shape, literally, genuinely, the size of your head. I managed about half of it before a semi-aneurysm, and suffered complete shame at having to throw so much food away. There's a photo of it here. (That plate is a dinner-plate.)