To make the marinade: mix all ingredients together in a bowl. Place the steaks in the bowl, cover and refrigerate for at least two hours.
To make the chimichurri: mix all the ingredients together in a bowl. Roughly chop the roasted peppers and add to the chimichurri. On a hot griddle pan cook the steaks quickly for 2-3 minutes on each side. Slice the steaks on the diagonal and place the hot griddled steaks on serving plates and top with chimicurri.