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CHILL YOUR BEANS
ISSUE 03 | BREWING GUIDES
Coffee beans being roasted
BREWING GUIDE

THE ART OF
COFFEE ROASTING

Understanding how heat transforms green beans into the aromatic, flavorful coffee you love.

By Chill Your Beans 7 min read Beginner to Intermediate

Roasting is where the magic happens. Green coffee beans are dense, grassy, and virtually flavourless. But apply heat carefully, and they transform into the rich, aromatic beans that deliver the complex flavours we crave in every cup.

The roasting process is a delicate dance of time and temperature. During those crucial minutes in the roaster, hundreds of chemical reactions occur — sugars caramelise, acids develop, and the characteristic flavour compounds emerge. Understanding roasting helps you choose beans that match your taste preferences perfectly.

"ROASTING IS WHERE GREEN BEANS BECOME THE AROMATIC COFFEE YOU LOVE."

CHAPTER 01

UNDERSTANDING ROAST LEVELS

Different roast levels of coffee beans

Roast level dramatically affects flavour profile. Light roasts preserve origin characteristics; dark roasts develop bold, roasty notes. Here's what to expect at each level:

LIGHT ROAST

180-205°C • First Crack

Bright acidity, floral and fruity notes, tea-like body. Best for showcasing origin characteristics.

MEDIUM ROAST

210-220°C • Between Cracks

Balanced acidity and body, caramel sweetness, nutty undertones. Our most popular profile.

MEDIUM-DARK

225-230°C • Start of Second Crack

Rich chocolate notes, fuller body, slight bittersweet finish. Great for espresso.

DARK ROAST

230-245°C • Through Second Crack

Bold, smoky flavours, low acidity, heavy body. Origin character gives way to roast character.

Fresh roasted coffee beans

"THE SAME BEAN ROASTED DIFFERENTLY WILL TASTE LIKE COMPLETELY DIFFERENT COFFEES."

CHAPTER 02

THE ROASTING PROCESS

1

DRYING PHASE

Green beans contain 8-12% moisture. The first few minutes drive off this water as the beans turn from green to yellow. The beans smell grassy and hay-like during this stage.

2

MAILLARD REACTION

Around 150°C, amino acids and sugars begin reacting — the same process that browns bread and seared meat. The beans turn brown and aromatic compounds start forming. This is where flavour development begins.

Did you know? The Maillard reaction creates over 800 different aromatic compounds in coffee.

3

FIRST CRACK

At around 196°C, pressure builds inside the beans and they crack audibly — similar to popcorn. This marks the minimum roast level. Light roasts are pulled shortly after first crack.

4

DEVELOPMENT

After first crack, the roaster controls heat carefully. Longer development time creates sweetness and body; faster development preserves brightness. This is where the roaster's skill shows.

5

SECOND CRACK & COOLING

Around 224°C, a second, quieter crack signals oils migrating to the surface. Dark roasts continue past this point. The beans are then rapidly cooled to stop the roasting process.

CHAPTER 03

FLAVOUR DEVELOPMENT

ACIDITY

Light roast

Dark roast

Acidity decreases with roast level. Light roasts are bright and tangy; dark roasts are smooth and mellow.

BODY

Light roast

Dark roast

Body increases with roasting. Light roasts feel tea-like; dark roasts are full and heavy.

SWEETNESS

Light roast

Medium roast (peak)

Sweetness peaks at medium roasts where caramelisation is balanced with bean sugars.

CHAPTER 04

FRESHNESS MATTERS

01

REST AFTER ROASTING

Fresh roasted beans need 2-7 days to degas. CO2 escaping can cause uneven extraction. Patience rewards.

02

PEAK FLAVOUR WINDOW

Most coffees taste best 7-21 days after roasting. After that, flavours begin to fade and stale.

03

STORE PROPERLY

Keep beans in an airtight container away from light, heat, and moisture. Never refrigerate or freeze.

04

BUY WHOLE BEAN

Ground coffee stales 10x faster. Grind just before brewing for maximum freshness and flavour.

05

CHECK THE ROAST DATE

We print roast dates on every bag. Look for coffee roasted within the last 4 weeks for best results.

06

SMALL BATCH IS BEST

Buy what you'll use in 2-3 weeks. Fresh beans are worth the extra effort of ordering more often.

NEXT STEPS

TASTE THE FRESHNESS

All our beans are roasted in small batches and shipped within days. Experience the difference fresh makes.

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