Woot, I found galangal roots!

They had them at our local megamarket, and of course I promptly bought some.

I don't know if these are greater galangal (Alpinia galanga) or lesser galangal (Alpinia officinarum) - or something else again. (I'd love to know, though.)

Now, hints and tips. How should I use them? Throw them into stirfry? Slice'n'dry and use in teas? Something else?