At Coffest Roastery, every roast is guided by science, data, and careful sensory evaluation.
While many think roasting is simply “heating coffee beans,” true specialty-grade roasting demands accuracy, discipline, and a deep understanding of how heat transforms flavor.
In this roasting insight, we’ll take you behind the scenes into our workflow — and share roasting tips you can use at home or in your own roastery.
1. Our Roasting Philosophy: Precision + Purpose
We believe that every coffee origin deserves a roast profile that respects its terroir — whether it’s the floral notes of Gayo, the chocolate sweetness of Lintong, or the tropical fruit character of Kerinci.
At Coffest Roastery, we follow three principles:
1) Roast to express origin, not hide it
We don’t burn, flatten, or mask flavors.
We aim for clarity, sweetness, and balance.
2) Data first, palate always
Our team uses:
real-time temperature logging (BT / ET)
Rate of Rise (RoR) curve monitoring
charge temperature consistency
post-roast cupping for verification
3) Consistency obsessed
Repeatability ensures trust.
Every batch from 120 g samples to 3 kg production follows controlled parameters
2. Our Exact Roasting Workflow
Below is a simplified version of the real process in our roastery.
Step 1 — Analyze the Green Beans
We evaluate:
moisture
density
screen size
processing method
expected flavor notes
High-density beans (like Kerinci or Papua) need more energy at charge.
Lower-density naturals (like Brazil) require gentler heat application.
Step 2 — Set Charge Temperature
Charge temp depends on:
batch size
density
processing
drum thermal stability
For example:
High-density washed beans: 185–200°C charge
Natural anaerobic: 170–185°C charge
A stable charge defines the entire roast curve.
Step 3 — Control Rate of Rise (RoR)
RoR is the heartbeat of roasting.
We monitor:
early RoR boost for momentum
mid-phase RoR flattening to prevent scorching
pre-first-crack RoR decline
post-crack RoR gentle slope for controlled development
A smooth RoR = clean cup.
A crashing or flicking RoR = baked or harsh flavors.
Step 4 — First Crack & Development Phase
This is where sugars caramelize and the coffee’s final character forms.
At Coffest Roastery:
Filter roast DTR: 12–15%
Espresso roast DTR: 15–20%
Dark roast (rare): up to 22% depending on bean
We extend sweetness without pushing the roast into bitterness.
Step 5 — Cooling (Critical!)
Beans must cool in under 2 minutes.
Slow cooling = smoky, harsh, ‘stall’ flavors.
Our cooling tray is monitored so that every batch stops roasting the moment it drops.
3. Roasting Tips From the Coffest Team
Even if you roast at home or on a small machine, these principles apply:
Tip #1 — Preheat your roaster consistently
A cold drum = unpredictable roast.
A stable drum = repeatable roast.
Tip #2 — Watch your RoR more than your temperature
Temperature alone is not enough.
RoR tells you where the roast is heading.
Tip #3 — Log everything
Charge temp, gas settings, airflow changes, turning point, milestones everything.
Patterns are your best teacher.
Tip #4 — Understand your airflow
More airflow = cleaner cup.
Less airflow = more body but risk of smokiness.
Use with intention.
Tip #5 — Taste every batch
Even perfect curves mean nothing unless the cup confirms it.
Cupping is non-negotiable.
4. Why Coffest Roastery Shares These Insights
Because we believe transparency builds trust.
Because Indonesian coffee is world-class and deserves world-class roasting.
And because when customers understand our process, they appreciate every cup even more.
At Coffest Roastery, our mission is simple:
Want to taste the result of data-driven roasting?
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