It was August 2006 when chefs Nicola and Fabrizio Carro, identical twins from the Piedmont region, introduced their exquisite Northern Italian fare at Quattro in Miami Beach. One can never have too many chefs imported from Italy. On the other hand, a saturation point exists for restaurants imported from New York — especially when said restaurant's big-name chef lets his name do more work here than his body. More to the point: The Manhattan-to-Miami restaurant exchange has been one-sided for too long. So when our own hometown Quattro opened a sister establishment in New York (in the Trump SoHo no less!), it made a statement of sorts: Miami's dining scene is growing up fast, and it might not be fitting into the Big Apple's hand-me-downs for long.