When I went to Margaritaville a few years back assuming they'd have a pretty safe burger, I knew from the first bite that the meat wasn't beef. I asked the server (who spoke perfect English, so no language barrier) "this isn't beef, is it?" He wouldn't answer and just kind of shrugged and pretended like he suddenly couldn't understand me. I had plenty of great meals at Rock n Java, but never tried their burger.