Roasting coffee - made easy

Ever brewed a coffee that looked perfect and still tasted disappointing? Roast Rebels founder Ingo walks through the real reason: the green coffee bean itself, not the roasting machine, is the single biggest factor behind how your cup tastes. This episode is a deep dive into the six pillars that shape coffee flavor before roasting even starts: species and variety, processing method, origin, altitu...

Four sample roasters go head-to-head on the same coffee, and only a blind cupping decides the winner. Ingo lines up the Ikawa, the Roest L200 Ultra, the Kaffelogic Nano7 and the Nucleus LINK, roasts one washed Colombia on each machine using nothing but its out-of-the-box profile, then hands the cups to two people whose palates you can trust: Sierra Yeo, reigning Swiss Brewers Cup Champion and Q Gr...

Colombia might be the most rewarding second origin any coffee lover can explore. It combines a centuries-old washed-coffee tradition that's forgiving to roast with a fast-growing wave of experimental processing that keeps surprising even seasoned roasters. Ingo breaks down both sides in this episode. Coffee reached Colombia in the early 18th century, brought over by Jesuits from Venezuela. The fir...

What does it actually cost to open your own coffee roastery? Ingo from Roast Rebels walks through every real expense involved in building a roastery from scratch — and lays out a much cheaper way to get started before you commit six figures. Building a full setup around a 10–15 kg roasting machine lands most people somewhere between €80,000 and €100,000. The roasting machine itself, plus its add-o...

Fresh back from Brussels: Sierra just competed at the World Brewers Cup 2026, and in this episode she sits down with Ingo to watch her own routine together — pausing along the way to unpack the details behind every pour. From a brand-new vacuum degassing tool to a strict 10-minute clock that punishes every second over the limit, this is a behind-the-scenes look at what it actually takes to compete...

The Nucleus LINK is used by more World Brewers Cup and World Barista Championship competitors than any other roasting machine. In this 65-minute webinar, Jerome Rosler and Sam Corra from Nucleus Coffee Tools walk through the exact roast profiles, competition case studies, and setup decisions that have taken athletes to the top of the podium — and answer your questions live. What you'll learn in th...

There are dozens of moisture and water activity meters for coffee on the market — but what are the actual differences, and which one do you need? In this episode, Ingo from Roast Rebels compares five devices on the same green coffee sample: the CoffMeter M1, Lighttells MD-500, DiFluid OMIX Plus, Lighttells AW-600, and CoffMeter W1. Full technical breakdown plus live measurement results for all fiv...

You roast the same coffee, same profile — and it tastes completely different. The culprit is often hiding in your green coffee beans: moisture content and water activity. In this episode, Ingo from Roast Rebels breaks down what these two parameters mean, why they matter for green coffee quality and food safety, and how they directly shape your roast. What you'll learn: ▸ Moisture content should si...

Want to learn how to roast coffee but have no idea where to start? In this episode you get a structured overview of all learning paths – from in-person courses and online learning to books, coaching and learning by doing. And you'll find out what you should actually focus on first – the answer surprises most people. What's covered in this episode: Why sensory skills are the most important...

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 sig...

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 championshi...

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 us...

In this short but vital extract from the Aillio Bullet Masterclass, we deep dive into the technology that makes the Bullet roaster one of the most precise home/prosumer machines available: its innovative sensors! Understanding these sensors is key to unlocking consistent, professional-grade roast profiles. We break down the three main sensors, explaining exactly what they measure and how to use th...

In this exclusive interview, we sit down with Mikaël Portannier, the current World Coffee Roasting Champion, to discuss his incredible journey. From his beginnings in catering school to competing in his first student championship, Mikaël shares the key moments that ignited his passion for coffee. Discover how a simple contest led him down a path of continuous learning, transforming him from a bari...

Win on purpose! In this advanced session with Sam Corra and Jerome Rosler from Nucleus Coffee Tools, we break down how to design, validate, and execute competition‑ready roast profiles. Built for professional baristas, roasters, and coaches, this webinar connects green coffee physics, sensory goals, and stage workflow into a repeatable system you can trust on the world stage. You’ll learn how to t...

The Recipes feature in RoasTime is one of the most powerful tools for Aillio Bullet users – but many roasters don’t use it to its full potential. In this video, I show you step by step:🔥 What Recipes in RoasTime actually are🔥 How to create, save and customize your own Recipes🔥 How to run a roast fully automated – or semi-manual🔥 And how Recipes help you roast more consistently, more efficientl...

Sample roasting isn’t just about tasting coffee – it’s about making the right decisions for your production roasts. In this video, I show you how I roast samples on the ROEST L100 Plus, with a clear goal:Getting profile data you can actually use – whether you’re buying green coffee, checking quality, or preparing for production. You’ll learn: How I evaluate green coffee for my assortment What I lo...

In this exclusive webinar, we’re joined by Jamison Savage (Finca Deborah, Panama) and Sam Corra (Nucleus Coffee Tools) to dive deep into the world of competition-level coffee production and roasting. Learn how the winning coffees Nirvana, Elipse and Terroir dominated the World Barista Championships, and get expert insights into processing, fermentation, drying methods, and roasting techniques usin...

A sample roaster is the second most important tool in a coffee roastery – but how do you choose the right one? In this video, we dive deep into sample roasting: What is it, why does it matter, and which machines stand out? We explore the key functions that improve your roasting and compare popular models like the classic barrell roasters, Kaffelogic Nano 7, Nucleus Link, ROEST Sample Roaster or th...

What happens at barista championships? How do you prepare optimally for a competition? Why is the Nucleus Link so popular in coffee competitions? And what are the insider tips for home baristas & aspiring champions? In this interview, I talk to Felix Hohlmann, co-founder of Kaffeemacher:innen, the current German Barista Champion, and third-place finisher in the German Roasting Championships. F...

The ROEST L100 Plus Sample Roaster is one of the most advanced sample roasting machines on the market. In this video, I take a detailed look at its features, functions, and share my personal experience using it. What you'll learn in this video:✅ How the ROEST Sample Roaster works✅ Key features & built-in sensors✅ Who this machine is for – coffee traders, roasters & competitors✅ My...

The Aillio Bullet is an incredible machine, but experience—both from using it extensively myself and from daily interactions with our customers—shows that there are key insights that can massively enhance your roasting experience. That's why we created a comprehensive online course covering all models—R1, R2, and R2 Pro. The course is now live. For more details, visit: https://academy.roastreb...

Washed, natural, anaerobic processed coffees. How does the ideal roasting curve change based on the processing of a coffee. Sam Corra shared his knowledge and experience in this 1.5 hour webinar. Good news, we have more webinars planned in the next month. They are free and open to anyone. Just make sure, you subscribe early. Next dates: Transforming sample roast into production roast Thursday, Dec...

Liberica coffee contains significantly more caffeine than Arabica, according to some studies. However, other studies suggest that Liberica has considerably less caffeine than Arabica. What’s the truth? We delve into this question in this video. If you can’t wait for the results, here are the measurements: Caffeine in mg/dl – Prepared as CGI Cupping: Canephora (Robusta) - India Parchment: 93.5 Arab...

Aillio is set to launch two new coffee roasters in the fall of 2024: the Aillio Bullet R2 and the Aillio Bullet R2 Pro. In this video, I’ll walk you through the features of these new roasters, compare the Bullet R1 and Bullet R2, and highlight the differences between the Aillio Bullet R2 and the Aillio Bullet R2 Pro. Reserve your machine now in the pre-sale by sending me a message at: ingo@roastre...