Some coffee snobs might call this sacrilege. Cold brew is supposed to take a long time — that’s part of how it gets its characteristic smoothness. But a group of engineers from the University of New South Wales (UNSW Sydney) have figured out a way to cut the time down from several hours to a mere three minutes, using ultrasonic waves.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/05/08/much-faster-cold-brew-through-cavitation/