I do wonder about "bloodwine," though. You can't actually make wine out of blood, can you? It must be a figurative name.
It's worth noting that the Klingon name for bloodwine,
'Iw HIq, simply means "blood alcohol". So, to the retconner, perhaps it is the "blood" part that is figurative, or perhaps the "wine" part is just a bad translation that stuck.
And what about raktajino? The name sounds like a play on cappuccino. So is it a human nickname for a Klingon beverage, or is it actually the Klingon name for it? It's "Klingon coffee," but what does that mean? Apparently Marc Okrand's Klingon for the Galactic Traveler says (or Memory Beta says it says) that it's actually a blend of coffee (the Earth beverage) and a Klingon drink called ra'taj liqueur. But canonically it's just "Klingon coffee," implying an equivalent of coffee made from some Qo'noSian bean with a high caffeine content.
Indeed, the explanation in
Klingon for the Galactic Traveler is as follows:
Coffee was originally a human invention.
It was then introduced to Klingons through trade and looting, and Klingons eventually started cultivating on their own (and, in their view, improving it), and they call it
qa'vIn.
[This also works fairly well with John M. Ford's account in
The Final Reflection, where - as I recall it - coffee is called
kafei in klingonaase, and it is described as having been looted from Federation ships. The main character finds it distasteful at first but develops a taste for it over time.]
Klingons then started adding alcohol to their
qa'vIn, and then it is called
ra'taj (or
raktaj in "English").
At some point, the humans got wind of this, and started developing a taste for
ra'taj. However, they're not as big on alcohol, so they developed a non-alcoholic variant with steamed milk, and called it a
raktajino.
So, in the end, raktajino is only about as Klingon as
fortune cookies and chop suey are Chinese.
I'm sure there's a quote or two in DS9 that contradic this, but on the whole, I think it's a pretty good model.
I wonder if the Klingons eventually developed a taste for raktajino themselves, so that the exchange has come full circle (maybe they'll start adding alcohol to raktajino?).
...or perhaps they drink it around humans because it's the closest you can get to proper
ra'taj or
qa'vIn, or because they find it exotic and like trying new things.