This is easily one of the best fruit infusions I have ever had, and not just because it’s incredibly expensive, rare, and virtually non-existent in my country (the US). Unfortunately, the quantity you are served at Blue Bottle Coffee siphon bar in Chelsea/Meatpacking District of NYC is far too little: I would say about 3 to 4 ounces alongside a bourbon-infused marshmallow (which is also fantastic).
The first thing you notice is the aroma is intoxicating: like cherry raisins and papaya and tobacco husks. Then the taste, bitter and sweet at the same time, but also fruity and playful. Some say apple chips, others say licorice, but I stick with dried fruits like cherries and cranberries.
Served unsweetened, it is perfect as is and it should be steeped for a minimum of 6 minutes, though 8-10 is preferred. WHile it does not serve the same caffeinating quality of coffee, it certainly packs a robust fruit flavor with earth undertones and even some orange rootiness the longer it steeps. The color is gorgeous and is not to be denied.
Good luck finding it though as there are only three companies on record who even sell it and I’ve only found one coffee bar in the NY metro area that serves in miniature glasses.