A new spot called Montesacro Pinseria Romana is now open in Williamsburg at 432 Union Avenue, very close to the Lorimer L stop. The Italian joint will focus on Roman-style flatbreads, called pinsas, but will also serve cheese, meats, and some staple entrees like pork chops and fresh pastas. Currently, they’re only open for dinner, but brunch and lunch will begin soon. The original, critically acclaimed Montesacro was launched four years ago in San Francisco by Gianluca Legrottaglie and quickly became a true …