I've tried Chromatic's "Radio" offerings before without a lot of luck. Partly, due to not having sophisticated enough grinder and espresso machine, and largely out of not quite knowing what to do with them. These days, I have a very good grinder and a very good espresso machine.
I also did some reading of the Chromatic Coffee blog on the "Radio" coffee line.
•Very light, very rapid roast.
•Pull it with a quite hot espresso machine.
•Use incredibly soft water.
This is all a bit different, especially that last part. According the blog, they're pulling it with water at about 20ppm. That's near distilled, and pretty much what a home-grade RO system puts out.
Since I happen to have a RO system, and a Linea Mini which can easily dial in whatever temperature I want, and a pretty dang awesome Monolith conical grinder, I revisited.
I think these guys are onto something. As opposed to "on something". http://www.chromaticcoffee.com/blog/quick-qa-on-radio/http://www.chromaticcoffee.com/blog/wat ... -approach/
So I bought a bag of the Radio Ethiopia Konga. I purged the Linea Mini with RO water with just a splash of my usual Crystal Geyser water to just lightly mineralize it. I set the thumbwheel brew temp dial to 204f degrees. I ground, I dialed and I tasted.
Sure enough with a little adjusting, I pulled a very, very fruity and sweet espresso. An unusually fruity, mango and berry tasting and smelling espresso. All at temperatures and water mineralization levels which would pull nothing but thin and bitter sink-fillers from every other coffee I can think of.
Man, this stuff is much lighter in roast. So much so that it even looks completely different in the knock-box.