In June, Daniel Korson, the founder of Richmond-based Coracao Chocolate, was at the Specialty Food Association's Fancy Food Show in New York and found there was no escaping the Dubai chocolate craze. Long in the chocolate industry, Korson said he can't remember another chocolate trend that has taken hold quite like this one, which piqued his curiosity. But Korson gave up cane sugar long ago. And he doesn't eat gluten or dairy either, so as much as he was intrigued, he couldn't try it himself.