Rob Hoos is back! Three years after our first viral interview (50k+ views), we dive deep into his latest research on airflow, cultivars, and roasting physics. 👉 Rob's new book "Cultivar": https://roastrebels.com/en/cultivar-a-practical-guide-for-coffee-roasters/In this exclusive deep dive, Ingo talks to world-renowned roasting consultant and author Rob Hoos. Rob shares his most significant breakthroughs from the last three years of research and consulting.We’re breaking down the myths: Why is the genetic variety (cultivar) often more important than terroir? How does airflow impact the actual weight loss curve and flavor development? And how do you roast a Maragogype to bring out those elusive tropical fruit notes?Whether you are a home roaster or running a commercial roastery, this interview will fundamentally change how you approach your roast profiles.00:00 – Welcome back, Rob Hoos: A 3-year followup 00:32 – Who is Rob Hoos? Consulting, Books & SCA 01:43 – The biggest learnings from the last 3 years 02:15 – Focus on Cultivars: Beyond field blends 03:54 – Airflow Revolution: Impact on flavor & weight loss 05:45 – Convection vs. Conduction in drum roasting 07:22 – Why the deep dive into Coffee Cultivars? 09:50 – Terroir vs. Genetics: How understanding has shifted 11:43 – The Maragogype Revelation: Tropical fruit from PNG 16:20 – The "Cultivar Project": 8 years of research 19:35 – Coffee Science: The evolution since the 2000s 22:20 – Altitude & Terroir: Correlation vs. Causation 24:44 – The Galapagos Case: High density at low altitude 30:08 – Genetic Purity: Cross-pollination and seed banks 33:55 – The mystery of "SL-R": A hidden Castillo story 37:40 – The 4 Genetic Groups: Typica, Bourbon, Ethiopia, Hybrid 40:40 – Roasting Strategy: Why "Fast" isn’t always best 46:15 – Moisture & Density: Applying heat energy correctly 51:40 – Why wet coffee can "run away" from you 54:20 – The "Perfect Recipe": Roasting for maximum fruitiness 57:34 – Rob Hoos’ Online Community & Mentorship 59:30 – Conclusion: Final thoughts on the coffee industry► Find Rob Hoos’ new book "Cultivar" here: https://roastrebels.com/en/cultivar-a-practical-guide-for-coffee-roasters/► Visit Rob Hoos online: https://www.hoos.coffee ► Follow Rob on Instagram: https://www.instagram.com/robhoos/► Join the Roast Rebels Movement: https://roastrebels.com▬ About this channel ▬▬▬▬▬▬▬▬▬▬▬▬At Roast Rebels, our mission is to make coffee roasting easy. On the one hand we offer the most proven small scale roasting machines and high quality green coffees, on the other hand we want to support people who roast coffee with tips, knowledge, roasting profiles and tutorials to achieve good roasting results quickly. You'll find lots of information and roasting profiles on our website, as well as here on the YouTube channel. #homeroasting #coffeeroasting▬ More Information ▬▬▬▬▬▬▬▬▬▬▬▬You will find a lot more information as well on our website: https://roastrebels.com/en▬ Social Media ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬►Facebook: https://www.facebook.com/roastrebels/►Instagram: https://www.instagram.com/roastrebels/►Newsletter: https://eepurl.com/dxHgML►Podcast (Roasting coffee - made easy): https://anchor.fm/roasting-coffee►Onlineshop for European coffee roasters: https://roastrebels.com/en/►Onlineshop for coffee roasters in Switzerland: https://roastrebels.com/ch/en/#CoffeeRoasting #RobHoos #RoastRebels #SpecialtyCoffee #RoastProfile #CoffeeScience #Cultivars #HomeRoasting

We are sitting down with the current German Brewers Cup Champion, Urs Rotzinger, to discuss his journey from home brewer to winner, his mentors, and his competition strategy. And: Urs roasted his award-winning Carbonic Maceration Geisha on the Kaffelogic Nano 7 and shares his winning profile.Urs shares exclusive, detailed insights into what truly matters for success in the Brewers Cup championship – and the crucial lessons he learned from his first attempt.▶️ Urs Rotzinger’s Kaffelogic Nano 7 Competition Roast Profile (Free Download): will follow tomorrow🛒 Get the Kaffelogic Nano 7 at Roast Rebels: https://roastrebels.com/en/kaffelogic-nano-7e/🎓 Kaffelogic Online Roasting Course (Your perfect starting point): https://academy.roastrebels.com/course/coffee-roasting-kaffeelogic🏆 Follow Urs: https://instagram.com/urs_rotInterview Highlights:00:00 - Welcome & Introduction to Urs Rotzinger 00:42 - Urs' path to Specialty Coffee 02:50 - The First Brewers Cup: Learning the importance of gratitude 04:55 - The biggest learning: Mastering the "Cup Connection" 09:50 - Choosing the Champion Coffee: Nicaragua Geisha 11:30- Why the Kaffelogic Nano 7? Control, Batch Size, and making mistakes 14:00 - How Urs developed his winning roast profile (Trial & Error) 15:40 - Degassing Secrets: How long coffee needs to rest after roasting 18:15 - Urs' top tip for anyone considering competing 20:30 - Next up: World Brewers Cup in Brussels & filter coffee courses #RoastRebels #KaffelogicNano7 #UrsRotzinger #BrewersCup #GermanBrewersCup #CoffeeRoasting #SpecialtyCoffee #HomeRoasting #geishacoffee ▬ About the Kaffelogic Nano 7 roaster ▬▬▬▬▬ The Kaffelogic Nano 7 is a small and automatic fluid bed roaster. In 10 minutes, you can roast up to 120g of coffee. The roaster is shipped including 15 preprogrammed and high-quality roasting profiles so that you can roast a great coffee by just chosing the right profile, chosing the right roast degree and the machine does the rest for you. If you want to change the roast profiles, you can do that with the powerful free software that comes with the roaster. In addition to home roasting, the Kaffelogic Nano 7 is particularly popular for sample roasting - e.g. for professional roasters, producers and green coffee traders.You can find more about the roaster here: https://roastrebels.com/en/coffee-roaster/kaffelogic-nanoOr, if you come from Switzerland here: https://roastrebels.com/ch/en/kaffelogic-nano-7e/▬ About this channel ▬▬▬▬▬▬▬▬▬▬▬▬At Roast Rebels, our mission is to make coffee roasting easy. On the one hand we offer the most proven small scale roasting machines and high quality green coffees, on the other hand we want to support people who roast coffee with tips, knowledge, roasting profiles and tutorials to achieve good roasting results quickly. You'll find lots of information and roasting profiles on our website, as well as here on the YouTube channel. #homeroasting #coffeeroasting▬ More Information ▬▬▬▬▬▬▬▬▬▬▬▬You will find a lot more information as well on our website: https://roastrebels.com/enOr if you are from Switzerland: https://roastrebels.com/ch/en▬ More Videos ▬▬▬▬▬▬▬▬▬▬▬▬More home roasting knowledge: ⁨@CoffeeRoasting⁩ Mehr Heimrösterwissen auf Deutsch: ⁨@RoastRebels⁩ ▬ Social Media ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬►Facebook: https://www.facebook.com/roastrebels/►Instagram: https://www.instagram.com/roastrebels/►Newsletter: https://eepurl.com/dxHgML►Podcast (Roasting coffee - made easy): https://anchor.fm/roasting-coffee►Onlineshop for home coffee roasters: https://roastrebels.com/en/►Onlineshop for Swiss coffee roasters: https://roastrebels.com/ch/en/

We sit down with the brand new Swiss Brewers Cup Champion, Sierra Yeo, just three days after her incredible victory! Sierra shares all the details from one of the most competitive Swiss Brewers Cup in years , her mental preparation strategies , and the intense process of dialing in coffee under pressure.She also reveals the story behind her championship-winning coffee, the unique equipment she used, and, most importantly, the full recipe so you can recreate her brew at home! 🏆 Championship Coffee & ProcessThe Coffee: Mount Tumas pre-dried cold fermentation natural Geisha from Chiriquí, Panama. The Producer: Karen – who used a complex 5-day pre-dry, 15-day river water fermentation, and 8-week drying process. The Flavors: Rose, Grape, Peach, Mandarin, and lots of honey sweetness (you can even rap them). ☕ Sierra’s Winning Recipe Breakdown (Full Demo at the end!)Sierra shares her full recipe using a small dose to maximize bed depth and extraction: Dose: 14g Coffee Water: 230g Water at 94°C Pours: 40g Bloom, followed by three more pours. Target Drawdown: 2:45 Water Chemistry: Built with Magnesium Sulfate (for acidity vibrancy) and Calcium Chloride (for silky mouthfeel). 🛠️ Equipment UsedSierra sourced unique equipment from her travels, to maximize aroma and clarity: Dripper: Hario Flow Dripper (Designed by Eric Liu from Taiwan) – Features a slightly convex, spoke-like design with a center magnet for a donut-shaped bed. Server: Icosa Cyclone Mini – Features internal ridges to aerate the coffee and a dome to prevent splashing/oxidation. Glassware: Orea Sense Glass (used to serve judges) – Sierra notes it gives the coffee more clarity and sweetness. 🔗 Links & Resources (Shop Now!)Get the Coffee! Limited drops of the winning Mount Tumas Geisha are available at Rose Coffee Roasters: https://rose-coffee.com/Connect with Sierra Yeo: https://www.instagram.com/sierrasriracha/Sample and Home Roasters, Brewing Equipment and more: https://roastrebels.com/enChapter:0:00 Sierra Yeo, Swiss Brewers Cup Champion 202620:15 Sierra's Swiss Brewers Cup Recipe#SierraYeo #BrewersCup #GeishaCoffee #HarioFlowDripper #CoffeeRecipe #SpecialtyCoffee #BrewingTips #RoseCoffeeRoasters #RoastRebels▬ About this channel ▬▬▬▬▬▬▬▬▬▬▬▬At Roast Rebels, our mission is to make coffee roasting easy. On the one hand we offer the most proven small scale roasting machines and high quality green coffees, on the other hand we want to support people who roast coffee with tips, knowledge, roasting profiles and tutorials to achieve good roasting results quickly. You'll find lots of information and roasting profiles on our website, as well as here on the YouTube channel. #homeroasting #coffeeroasting▬ More Information ▬▬▬▬▬▬▬▬▬▬▬▬You will find a lot more information as well on our website: https://roastrebels.com/enOr if you are from Switzerland: https://roastrebels.com/ch/en▬ More Videos ▬▬▬▬▬▬▬▬▬▬▬▬More home roasting knowledge: ⁨@CoffeeRoasting⁩ Mehr Heimrösterwissen auf Deutsch: ⁨@RoastRebels⁩ ▬ Social Media ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬►Facebook: https://www.facebook.com/roastrebels/►Instagram: https://www.instagram.com/roastrebels/►Newsletter: https://eepurl.com/dxHgML►Podcast (Roasting coffee - made easy): https://anchor.fm/roasting-coffee►Onlineshop for home coffee roasters: https://roastrebels.com/en/►Onlineshop for Swiss coffee roasters: https://roastrebels.com/ch/en/