Some things inherently sound like bollox. That espresso can be “shocked” is one of those things. It sounded so much like bollox that I bleated out such via twitter a little while ago and was met with a certain amount of people who agreed, and a certain amount who didn’t.
My error was in assuming it was bollox before actually testing it properly. Because sometimes things that sound like bollox… aren’t.
So briefly here was my test, which I did three times.
19g coffee, reaching about 30g beverage weight and 19% extraction in about 30s.
Incidently, the coffee was Hasbean’s (excellent!!) Bolivian Finca Bolinda.
Each shot was split. On one side over 32g of ice, and on the other into an empty (but otherwise identical) glass.
After brew 68g of cold water was added to each glass, followed by 32g of ice into the shot brewed into the empty glass.
Both beverages were allowed to sit for 10 minutes to thermo-equilibrate before tasting.
Tasing was a combination of sipping from the glass and slurping off a cupping spoon.