absolutely hoisin sauce, this thread is right up my alley. i love bbqing char sui ribs, you dont need a recipe just throw stuff together. the key to having good char sui is to add a ton of sugar, once you think theres enough add some more. i usually like to do them up with country style ribs or pork butt, i salt the raw meat first. my marinade is more like a dry rubb because there is very little liquid in it. its hoisin sauce. a little soy sauce, a good amount of garlic powder, a ton of sugar(min 3 cups for 5 #), a little bit os liquid smoke and a couple drops of red food coloring to make it look authentic. i rub on the mixure and let it marinade overnight, a ton of liquid comes out and i reserve that and cook it down to a glaze. once the ribs are almost done on the bbq i glaze them over.
so thats the long of how to do it for a carnivore, i suppose if your vegan you could throw the ingrediants together and cook in a sauce pan with a touch of water for the right consistancy.