Just had to share ...
On a whim, I mixed a bit of our elderflower syrup into some very tart already-brewed water kefir - and I tell you, it is DELICIOUS!
A quick google revealed that the combination of elderflower and kefir is not stunningly original, but it was new to me anyhow!
(And in passing I noticed some sites talking about the cosmetic applications of kefir . Anyone know anything much about that?)