1.In A Large Resealable Plastic Bag, Combine The First Six Ingredients; Add Flank Steak. Seal Bag And Turn To Coat; Refrigerate For 4 Hours Or Overnight. 2.Coat Grill Rack With Nonstick Cooking Spray Before Starting The Grill. Drain And Discard Marinade. Grill Steak, Covered, Over Medium Heat 6-8 Minutes On Each Side Or Until Meat Reaches Desired Doneness (For Medium-Rare, A Meat Thermometer Should Read 145 Degrees F; Medium, 160 Degrees F; Well-Done, 170 Degrees F). Let Stand For 10 Minutes Before Slicing.