The New York Burger Co, on the corner of 23rd street and 10th avenue, was, last Thursday, the hippest place to be in New York City. James Danziger celebrated the opening of his exhibition on Kate Moss with pictures by Gene Lemuel. Gene and his fiancée Jacqueline, who never make appearances, were there. The fries and mini-burgers were exquisite. It was the ultimate in New York sophistication.