I use this marinade for both skirt steak and flank steak and it is delicious. It doesn't cover up the taste of the steak too much, just makes it taste juicy and meatier. I just use the marinade recipe and grill on my gas grill. I've never tried the hot coal method.
Good marinade (I left out the garlic, though...personal preference). Easy, fast and a really nice result.
This is a great recipe, my husband just loves it. This is requested by him more then any other steak recipe I have.