Ultrasonic Espresso - A New Way to Brew Coffee | FRANCISCO TRUJILLO!

Can you make espresso with room-temperature water and sound waves? Dr Francisco Trujillo and his team at UNSW have developed an entirely new brewing process that uses ultrasound to produce espresso-strength coffee in under three minutes, while using around one-quarter of the energy of a traditional espresso machine. In this episode, Francisco takes us inside the science of ultrasonic coffee. We unpack acoustic cavitation, the microscopic bubbles that pit and fracture coffee grounds, why tamping matters far less in this system, and how the team built the technology into something that still looks surprisingly close to a normal espresso machine. We also get into the taste test. One hundred regular coffee drinkers compared the ultrasonic brew with traditional espresso, with no significant difference found across the key sensory measures. Francisco explains where the drinks do differ, including crema, bitterness and aftertaste, and why the biggest opportunity may not be your local café at all, but large-scale ready-to-drink coffee production. If you’re new here (welcome), our show dives into some of the best coffee conversations on the internet, but we will always remind ourselves at the end of the day: It’s Just Coffee! CHAPTERS! 00:00 A New Way to Brew Coffee 01:17 How Ultrasonic Espresso Works 02:18 Where the Idea Came From 03:29 From Three-Minute Cold Brew to Espresso Strength 04:58 Acoustic Cavitation Explained 10:35 Brew Ratio, Grind Size and Tamping 13:54 Is It Really Espresso? 16:34 Why the Brew Takes Three Minutes 18:04 Testing Different Coffees and Roast Levels 19:29 Brewing With Room-Temperature Water 21:40 The Blind Taste Test 28:24 What Happens to Aroma? 31:05 Extraction Yield and TDS 32:23 Less Bitterness and a Cleaner Aftertaste 33:48 The Energy-Saving Opportunity 35:41 APAX LAB 36:54 Can Ultrasonic Coffee Scale Up? 39:19 Patents and Commercialisation 42:04 Francisco’s First Coffee Project 44:39 The Team Behind the Research 45:08 Where to Find Francisco’s Work Dr Francisco Trujillo, UNSW: https://www.unsw.edu.au/staff/francisco-trujillo Ultrasonic espresso research: https://doi.org/10.1016/j.jfoodeng.2026.113193 Want more coffee content? IT’S JUST COFFEE: https://linktr.ee/itsjustcoffeepod Want to get in touch? Hit us up at hello@itsjustcoffeepod.com with your questions, hot takes or guest suggestions. Proudly sponsored by: APAX LAB: https://apaxlab.com/ Riverina Fresh: https://www.riverinafresh.com.au/ Thanks for listening! Learn more about your ad choices. Visit megaphone.fm/adchoices