Mama Gina's pizzeria has served Union Square for nearly four decades. This friendly pizza shop offers an array of pizza and sandwich choices. Sit at a booth and check out the Boston sports paraphernalia adorning the walls, grab a seat by the window and look out onto the square or call for delivery to Somerville, Cambridge or Medford. Mama Gina's says they always strive for timely delivery, to keep up their long-standing reputation.