May 16, 2015

Lukewarm-Brewing Coffee/コーヒーのぬるま湯抽出

I wanted to know what it would be like to brew coffee with lukewarm water rather than hot or cold water. I searched for an answer on the Internet, but in vain. So, I made an experiment.

20 g coarsely ground coffee, in the tea strainer that I used previously
粗挽きのコーヒー20 gを、前に使った茶こしに入れました。
I poured a small amount of hot water from the thermos for blooming.
The water was 80-85 degrees C (176-185 degrees F).

I put on the lid and let it sit for 3 minutes (not 30 seconds).
Then, I poured slightly less than 300 ml water at 41 degrees C (106 degrees F).
次に、摂氏41度(華氏106度)のお湯を300 mlよりちょっと少なく入れました。
I tried to refrain from stirring the coffee grounds as much as possible, like I usually do.
I let it sit for another 3 minutes, with the lid on.
I was surprised to see that the resulting coffee was at 42/108 degrees C/F. My insulated mug retains heat very well!
I transferred to coffee to another mug, leaving the dregs in the initial mug.
I heated the 300-ml coffee in the 800-W microwave for 1 minute. It was now 69/156 degrees C/F.
300 mlのコーヒーを800 Wの電子レンジで1分加熱しました。摂氏/華氏69/156度になりました。
Not bad! In fact, it was much better than I had anticipated. I couldn't tell it from coffee brewed at a higher temperature.

Dregs left in the second mug

To be continued.


Yubun said...

I have to try this next time. I tried cold brewing but I was not a big fan of the flavor.

Hiroyuki said...

Yubun: Do give it a try and report on your findings!

I also made a similar experiment with cold water at 20C, and found the resulting coffee was more like tea, but I liked it.

I was wrong when I said, "I couldn't tell it from coffee brewed at a higher temperature." I made a similar experiment with hot water at 80-85C, and the resulting coffee was much more robust.