From Green Bean to Your Cup: How Coffee Is Roasted

Before coffee becomes the aromatic, flavourful drink we know, it starts as a green coffee bean. Roasting transforms those raw beans, developing the colours, aromas and flavours that shape the coffee in your cup.

It's part science, part craft — and a fascinating step in the journey from farm to coffee table.

Starting with Green Coffee

Coffee beans begin inside the fruit of the coffee plant, commonly called a coffee cherry.

After harvesting, the cherries are processed to remove the fruit and prepare the seeds for drying. The resulting green coffee beans are sorted, stored and transported before they reach a roaster.

At this stage, the beans are dense and pale green. They don't yet have the familiar aroma of roasted coffee.

What Happens During Roasting?

Roasting uses heat to bring about a series of physical and chemical changes.

As the beans heat up, they lose moisture, change colour and develop new aromas. Sugars and other compounds react, helping create the flavours associated with roasted coffee — from toasted nuts and caramel to chocolate, fruit and spice.

The beans also expand and become more brittle.

Roasters carefully manage factors such as temperature, time and airflow to develop the desired flavour profile.

Understanding Roast Levels

Roast level is one of the most noticeable outcomes of the roasting process.

Light roasts generally preserve more of the coffee's origin character and can highlight bright, fruity or floral notes.

Medium roasts often offer a balance of sweetness, body and origin characteristics.

Dark roasts tend to develop deeper roasted flavours, which may include dark chocolate, toasted nuts or smoky notes.

These are broad descriptions. The final flavour also depends on the bean itself and the roasting approach.

Why Roasting Makes a Difference

The same green coffee can taste quite different depending on how it's roasted.

A roast profile can bring forward certain characteristics while softening others. The goal isn't simply to make beans lighter or darker — it's to create a coffee that tastes balanced and works well for its intended use.

Espresso and filter coffees may call for different approaches, depending on the desired flavour and brewing performance.

From Roasted Beans to Your Cup

Once roasted, coffee needs time to release some of the gases created during roasting. After resting, the beans can be ground and brewed.

Grind size, water temperature, brew ratio and extraction all influence the final cup, so the journey doesn't end when roasting is complete.

A Little Craft in Every Cup

Roasting is where green coffee begins to develop the aroma and flavour we recognise. Each decision — from selecting the beans to shaping the roast — helps determine what ends up in your cup.

The next time you open a bag of coffee, take a moment to notice its aroma. There's a whole journey behind it.

Explore Conway Coffee and discover the flavours that make every brew its own.