I would have to marinade them in a kiwi mixture for about an hour and then tenderize and season them with a southwestern mix then seared in a hot pan. Flank steaks are really tough pieces of meat and even tougher when grilled.
I can't believe that people ask for steak in a restaurant and ask for Med. Rare, and bitch about it being raw inside? are they mental or do they just not understand the procedure to cook such an article?