I have some really nice oolong tea that has ginseng in it. I use a yixing tea pot and brew it in fully boiling water.
Not really into brewing ginseng root straight, though I do love the taste and have drunk it on its own a few times (used to chew the roots sometimes aswell lol, dunno if its bad for you though so probs wouldn't do that).
Anyways, all I can say in relation to ginseng root is STORE IT WELL. I picked some up from a thai market and didn't realize that it was infested with weevils.....
craig