The Coke BBQ sauce can be made several days in or just before serving. Prepare a Big Green Egg for high, direct heat cooking. Combine the Coca-cola and vinegar in a small sauce pan and cook directly on the egg until reduced by half or about 15 minutes total cook time. Add the molasses, ketchup, and spices and whisk to combine. Keep cooking on the Big Green Egg for another 15 minutes or until reduced by half again. The right thickness should coat the back of a spoon.
Season the flank steak all over with salt. Quickly grill the steak directly on the hot grill. Grill on the first side for 5 to 7 minutes, then flip and grill again for 4 to 5 minutes. This will give you a perfect medium rare steak.
Remove the steak from the grill and rest for 5 minutes. Toast the tortillas on the still hot Big Green Egg, about 30 seconds per side. Slice the steak against the grain and serve the slices on the tortillas with the BBQ sauce, napa cabbage and a sprinkling of salt.
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