1/3 cup soy sauce (I used reduced-sodium)
1/3 cup vegetable oil
3 tablespoons dark brown sugar, packed
5 garlic cloves, minced
1 tablespoon tomato paste
1 tablespoon paprika (I reduced to about 2/3)
1/2 teaspoon pepper
1/4 teaspoon cayenne pepper (I reduced to 1/8)
1 (2 1/2-pound) beef flap meat*
*Flap meat is sold as whole steaks, strips, and pieces. For even pieces, buy a whole steak of uniform size and cut it up yourself.
Whisk soy sauce, oil, sugar, garlic, tomato paste, paprika, pepper, and cayenne together in bowl until sugar dissolves; transfer to zipper-lock bag. Pat beef dry with paper towels. Prick beef all over with fork and cut into 2 1/2-inch pieces. Add meat to bag with soy mixture and refrigerate for 2 to 24 hours, turning occasionally.
For a charcoal grill: Open bottom grill vents completely. Light large chimney starter filled with charcoal briquettes (6 quarts). When top coals are partially covered with ash, pour evenly over grill. Set cooking grate in place, cover, and open lid vents completely. Heat grill until hot, about 5 minutes.
For a gas grill: Turn all burners to high, cover, and heat grill until hot, about 15 minutes.
Clean and oil cooking grate. Cook beef (covered if using gas) until charred and registers 130 to 135°F (for medium), 8 to 10 minutes. Transfer meat to platter, tent loosely with foil, and rest for 5 to 10 minutes. Serve.
Note: Author flipped the steaks at 4 minutes, and they were temperature ready at 8 minutes.