Well... that colleague of ours who invited us over for lunch, had actually just went back to Vietnam last week... and he brought this back. It's sort of like snack, tid bits to be exact. However, it has all the original taste of jack fruit. Aside from jack fruit, there's also banana one but that one seems to be sticking to teeth. I quote from Day, "You eat one, you will have to spend 10 minutes trying to clean your teeth."
But this jack fruit one is good. So, if you do go to Vietnam, try looking for it. Guess it good to be brought back as souvenir, a lot of people can share the food ;)