How to Make Grilled Flat Iron Steak

Gather the ingredients. Place the steak in a shallow dish. Use a fork to prick the steak deeply, all over its surface, on both sides. In a small bowl, combine remaining ingredients and mix well. Pour over steak; cover and refrigerate for 1 to 24 hours. When ready to grill, prepare and preheat grill. Cook steak over medium coals for 3 to 4 minutes on each side, turning once, until medium doneness. This steak should not be cooked to medium-well or well-done, or it will be very tough. Place on cutting board, cover with foil and let stand 5 minutes. To serve, position the steak, so the grain is running from left to right. Hold the steak using tongs with your non-dominant hand. Using a very sharp knife, place the knife on the steak, then tilt it to the left. Slice the steak thinly. Serve immediately and enjoy!