01 -
In a large bowl or resealable bag, combine cilantro, garlic, cumin, brown sugar, soy sauce, lime juice, and chipotle in adobo sauce. Mix thoroughly to create a uniform marinade.
02 -
Add flap meat or flank steak to the marinade, ensuring all surfaces are coated. Cover or seal and refrigerate for at least 4 hours, preferably overnight up to 24 hours for optimal flavor.
03 -
Preheat a grill or grill pan over high heat until it reaches temperature, ensuring grill grates are clean and lightly oiled.
04 -
Place the marinated meat on the hot grill. Sear for 2 minutes, then flip. Continue flipping every 2 minutes to promote even cooking and minimize graying, grilling for a total of 5 minutes or until your desired internal temperature is 5°C below your final target.
05 -
Insert a meat thermometer into the thickest part of the steak. Refer to these targets: Rare: 52°C, Medium Rare: 57°C, Medium: 63°C, Medium Well: 66°C, Well: 71°C. Remove the beef once it is about 5°C under your preferred temperature to account for carryover cooking.
06 -
Transfer steak to a board, tent loosely with foil, and let rest for 10 minutes. Slice thinly against the grain for tenderness.
07 -
Serve the sliced beef in warm tortillas with chopped onions and sliced avocado, or your preferred garnishes.