For chimichurri, place the first 5 ingredients in a food processor; pulse until finely chopped. Add oil, vinegar, lime zest, lime juice, oregano, 1/2 teaspoon salt and 1/4 teaspoon pepper; process until blended. Transfer to a bowl; refrigerate, covered, until serving., Sprinkle steaks with the remaining salt and pepper. Grill, covered, over medium heat 5-8 minutes on each side or until meat reaches desired doneness (for medium-rare, a thermometer should read 135°; medium, 140°; medium-well, 145°). Let stand 5 minutes before slicing. Serve with chimichurri.