‘Ultrasonic espresso’ made with cold water and high-frequency sound waves uses less energy than the traditional version – and taste tests show it’s just as good.
First add a spoon of grounds or beans. Fill up your cup with water. Next is the fun part. Shake it for 20 thousand years at a few Hz or scream at your coffee as loud as possible for a few months.
First add a spoon of grounds or beans. Fill up your cup with water. Next is the fun part. Shake it for 20 thousand years at a few Hz or scream at your coffee as loud as possible for a few months.