Mexican food continues its norteamericano conquest. Just don’t call these newbies taco joints. In Scottsdale, MEZCAL specializes in regional Mexican cuisine, bringing a light touch to halibut Vera­cruzano and a trio of Oaxacan moles (480-556-0770, www.mezcal ROSA MEXICANO of New York fame rolls out a capital cousin in D.C. next month, with tri-level dining and a water wall by überdesigner David Rockwell (202-783-5522, And in New York, DOS CAMINOS SOHO capitalizes on the fame of its uptown twin with made-to-order guacamole, several ceviches, and comforting roast pork (212-277-4300, Good luck ordering a frozen prickly pear margarita elsewhere.