Coffee Supreme produce some seriously tasty coffee. Considering that I haven't brewed an aeropress in a few months (let alone ever attempted a cold brew version), besmirching them as to any results of this experiment would do extreme injustice. But don't stress too much, somehow I absolutely nailed it.
Here are a few considerations that you should note before brewing a cold coffee:
- The coffee is actually extracted with hot water in the brewing chamber, but is then rapidly cooled by ice sitting in a separate server or glass.
- Because of all the extra ice that inevitably melts when met by the hot brew, you really need to bump up that coffee to water ratio in the brewing device to balance things out.
- Thanks to that much higher coffee to water ratio, you're going to get a nice caffeine to cup of coffee ratio as well.
After some scouting of a few different recipes on the web, I settled on an amalgamation of a few. Using a light roasted Guatemalan Dos Rios by Coffee Supreme outta Melbourne, here's the vital statistics.
90g of ice sitting in the server
25g of coffee ground a bit finer than your normal pourover
An initial 90ml bloom of hot water (95 degrees centigrade) into the inverted aeropress
Stir that bloom quite vigorously to ensure all 25g of coffee is nice and wet
At 30 seconds, top up the aeropress to 200ml of water total
After a total 75 second brewing time flip that aeropress around and push the contents out onto the ice in the server. My press took me about 10-12 seconds.
Swish the contents of your server around until almost all the ice is melted (by this stage you should have a cold liquid).
This recipe left me with a brew that was syrupy to slurp, had a great mouthfeel, and well balanced acidity. Supreme's flavour notes of nougat and dried fruit were very much present as well. So impressed was I with my escapade I quickly brewed up a hot aeropress with a more traditional recipe (17g coffee, 215ml water, 75 seconds), thus completely defeating my purpose of brewing a cold coffee to cool off in the first place. It too tasted delicious. I then proceeded in an inspired and caffeinated state to respond to 16 unanswered emails I'd been saving for later, ask the neighbour how her plants were doing, save a cat, have a zooper dooper and predict Melbourne's weather for the afternoon. Supreme coffee is good stuff.