Australian scientists have developed a method of brewing coffee by blasting ground beans with sound waves – and it produces a powerful cup
’m looking at a coffee that’s thick, cold and the deep brown colour of 90% dark chocolate. It tastes like coffee but, weirdly, without any bitterness. It is the only coffee I’ve had that was made by blasting ground coffee beans with sound. They call it ultrasonic coffee.
In the regular coffee-making process, water extracts flavour from the outside of the coffee grounds . If you leave the coffee in for long enough you might extract some of the flavours from the centre of the coffee grounds but by that time you’ll have picked up some unfavourable flavours too – what baristas call overextraction.
The ultrasonic method sends lots of tiny bubbles into the water and coffee. When they implode, they make mini shockwaves that can pierce the inside of the coffee grinds in a phenomenon called acoustic cavitation.Two minutes later, the ultrasonic coffee drips from the portafilter, but the liquid is much darker than the caramel crema of an espresso. Trujillo hands me a paper cup of thick brown liquid.
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