Nick I see no reason why the idea can't work, but like machine I see no reason why the idea will automatically work either. I'm originally from New York and have never had a southern burger and sweet tea. I might very well like both (and assume I would), but since I've never had either before there's nothing to automatically draw me. If I saw a place serving southern burgers and sweet tea it wouln't get me to come in unless I was in the mood for a burger in general. The hard part might be getting people in for the first time.

That doesn't mean it can't be succesful. You mention having the opportunity to move to Hawii. I would decide whether or not you want to go first and this idea shouldn't be part of the decision. Assuming you go I would simply make the burgers and tea and see if the people you meet like them. If they do I'd say you can make the business work. If they don't seem particularly interested then it might not go over so well.