I somehow got home with a 20 oz. flank steak. I don't recall ever cooking the cut. It is supposedly tough but well flavored and popular in east Asian cooking.
So I marinated it for a few hours in the fridge. Then removed it and seasoned with a spice blend. Grilled it in a very hot skillet, about 4 minutes or so on each side, then reduced heat and covered a couple more minutes. It came out medium as it was not very thick. That was fine with my wife. Sliced against the grain to serve. It was similar to picahna in flavor and texture.
The marinade consisted of olive oil, fresh lime juice, balsamic vinegar, real maple syrup, kikkoman soy sauce, lea & perrin's worcestershire, louisiana hot sauce, and assorted spices.