HDV Christmas Tart. Bleh! It tastes like an antiseptic band-aid, with a little rubbing alcohol for fun. I've let it steep for almost two months, and it hasn't improved even a little bit. I've had to throw out the coil heads I used to test it with, even after soaking them in boiling water because I couldn't get the taint out.
(Otherwise, I've really enjoyed the HDV flavors I have though... It's just this one. Well, this one and White Goodness, which is pretty bad, but HAS actually improved a little with steeping. I think I'll give it another couple of months, and try it again.)