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1
Stir garlic powder, chili powder, Mexican oregano, 1 teaspoon salt, and 1 teaspoon black pepper together in a bowl. Sprinkle garlic powder mixture over both sides of flap steak, pat rub into meat, wrap steak in plastic wrap, and refrigerate for at least 8 hours or overnight.
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2
Whisk honey, lime juice, cilantro, chipotle peppers, garlic, vegetable oil, apple cider vinegar, chipotle mustard, cumin, 1/2 teaspoon salt, and 1/2 teaspoon black pepper together in a bowl. Cover with plastic wrap and refrigerate 1 to 2 hours. Separate mixture equally into two bowls; one for basting and one for serving.
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3
Preheat an outdoor grill for medium-high heat and lightly oil the grate.
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4
Cook steak on the preheated grill until smoke rises from the spice rub. Turn the meat and squeeze the juice from 2 lime halves over the steak. When the spice rub begins to smoke, turn the meat again. Brush the refrigerated honey-lime basting sauce onto both sides of the steak and cook steak to your desired degree of doneness, 8 to 10 minutes per side for medium. An instant-read thermometer inserted into the center should read 140 degrees F (60 degrees C). Let meat rest for 5 minutes and chop against the grain into bite-size pieces.
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5
Spoon grilled meat into tortillas. Top with onion, lime juice, reserved honey-lime serving sauce, and queso fresco cheese.
