Does that bring to mind any well-known kind of pastry - maybe smth humoristically called "bladders"? Or the author just means that the pastry looked like bladders with jelly on them (an unsavoury sight, I presume)? Benny is an old man from East Harlem if it's important.
UPDATE: Large jelly-filled doughnuts seem to fit the description. Thanks for answering, you are the best!