This one is apple wood bowl and walnut stem.
It can be done by opening in half the stem and gouging a channel both sides and then glueing with cianoacrilate.
This one is the case.

Or it can be done by choosing a very nice little branch and boring a hole through the center with a really hot and hard wire.

 

 Thanks very much for the lesson in pipe making!🙏🏻😀💜🫂💖😁👍

I'll have to give it a try one day...😃