Move over nitro, there is a new buzzword in the world of chilled coffee. Ultrasonic.
In the 90’s/early oughts iced coffee was mostly just leftover coffee dumped over ice. Progress has been made and now we all enjoy the full bodied, smooth tasting ‘cold brew.’
Brewing cold brew does come with downsides, primarily time. It takes anywhere from 12-24 hours to brew. The University of Sydney is on the case though. With ultrasonic waves pumped through a brew basket they acheived a rapid cold brew method.
The system connects a bolt-clamped transducer with the brewing basket via a metallic horn – transforming a standard espresso filter basket into a powerful ultrasonic reactor.
“Ultrasounds accelerate the extraction process due to acoustic cavitation,” he says.
“When acoustic bubbles collapse near the grounded coffee, they generate micro-jets with enough force to pit and fracture the coffee grounds – intensifying the extraction of the aroma and flavours of the brew.
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