Chimichurri is the most popular meat topping in Argentina. As noted in this veal milanesa article, Argentinians eat a lot of meat.

Chimichurris can be used as either a post grilling meat topper or as a marinade for steaks and chicken applied generously the evening before. Remember, when marinating, the easiest thing to do is dump everything into a freezer bag, then place in a bowl in your fridge. No mess, no cleanup the next day.