The Art of Roasting or How to Brew the Perfect Cup of Coffee

What is coffee roasting?

Coffee roasting is the step that transforms green beans into brown, aromatic beans ready to be ground. Under the effect of heat, their color, structure, and taste profile gradually evolve.

This process is therefore not simply about "cooking" the coffee. The roaster adjusts the temperature increase and development to achieve a balance between liveliness, sweetness, intensity, and roasted notes.

The result also depends on the coffee used. Botanical variety, origin, altitude, terroir, and cultivation method already shape the aromatic potential of the bean before it enters the roaster.

To understand what happens even further upstream, our article dedicated to agroforestry-grown coffee discusses the environment in which coffee plants can thrive.

What are the stages of roasting?

Roasting takes place in several phases. They follow each other without a sharp break: the bean gradually changes as it absorbs then releases energy.

Selecting green coffee

It all starts before the roaster is turned on. The quality of the green coffee and its characteristics determine the possibilities offered during roasting.

At KOOTA, our coffees come from Arabica beans sourced from organic farming and fair trade channels. If you wish to delve deeper into this topic, please refer to our article on why drink organic coffee.

Drying and temperature increase

The roaster is first preheated. Once the beans are introduced, they begin to lose their moisture and gradually change from green to yellow.

The temperature then continues to rise. Chemical reactions responsible for a large part of the color and aromas begin to gain importance.

The first crack

As it heats, the bean expands. The internal pressure increases until it produces an audible crack called the "first crack."

This marker is important for the roaster. It signifies the entry into a development phase during which the aromatic profile continues to transform.

Coffee development

After the first crack, the roaster chooses how much further to continue roasting. The duration and intensity of this phase directly influence the result in the cup.

A roast stopped relatively early will generally retain more liveliness. By continuing development, roasted notes become more prominent and bitterness may increase.

The second crack

During a deeper roast, a second crack may appear. The bean then becomes darker, and the flavors associated with roasting become more pronounced.

On darker profiles, oils may also become visible on the bean's surface.

Cooling

Once the desired roasting level is reached, the beans must be rapidly cooled to slow down the reactions caused by heat.

Roasting is complete, but preparing your cup is not. Grind size then becomes crucial. Our guide on different coffee grinds explains how to adapt it to your brewing method.

How does roasting influence taste?

More than just an opposition between "light" and "strong" coffee, the roasting level modifies the balance between the inherent characteristics of the bean and those created during roasting.

Light roast

A light roast tends to retain more liveliness and allow the fruity or floral notes present in the coffee to express themselves.

Acidity may be more perceptible, and flavors directly linked to the bean's origin generally remain more discernible.

Medium roast

Medium roasting seeks a greater balance between liveliness, sweetness, and notes resulting from the roasting process.

Aromatic families reminiscent of caramel, dried fruits, nuts, or chocolate can be found, depending on the coffee used and the chosen roasting profile.

Dark roast

As roasting progresses, roasted notes become more prominent. The coffee can develop more bitterness and sensations evoking dark chocolate, spices, or smokiness.

Acidity generally becomes more discreet.

Very dark roast

Very dark roasts further accentuate the flavors linked to roasting. Smoky or intensely roasted notes can then dominate the bean's initial profile.

Therefore, there is no universally "best" roasting level. The right profile depends on the coffee, the brewing method, and most importantly, what you enjoy in your cup.

What role does the Maillard reaction play?

The Maillard reaction is one of the major phenomena in roasting. Under the effect of heat, certain sugars and compounds containing amino acids react and give rise to numerous aromatic compounds.

It contributes to the browning of the bean and the appearance of many notes associated with roasted coffee: toasted bread, dried fruits, caramel, or chocolate.

However, it does not act alone. Other thermal transformations occur during roasting and also contribute to the development of taste and aroma.

This is why simply increasing the temperature does not mean obtaining "more aromas." An overly advanced roast can, on the contrary, mask certain characteristics inherent in green coffee.

How does KOOTA approach its coffee profiles?

At KOOTA, bean selection and roasting are considered together. Our coffees come from organic Arabica beans and fair trade channels.

To understand what this approach specifically entails, you can consult our article explaining why KOOTA offers fair trade coffee.

The roasting level then allows each recipe to be guided towards a different profile: more balanced and aromatic, more intense, or more focused on expressing an origin.

The goal is therefore not to roast all coffees in the same way, but to build a profile consistent with the desired result in the cup.

Which coffee to choose based on your taste?

Roasting fully makes sense when it matches your way of drinking coffee. KOOTA offers several profiles and formats for comparison.

• To prepare your coffee from whole beans, discover our selection of organic whole bean coffee.
• For a balanced and aromatic profile, discover our Harmonieux quality whole bean coffee.
• If you are looking for more intensity, our Puissant 250g whole bean coffee offers a darker roast.
• To discover a single origin, you can turn to our Colombia whole bean coffee.
• If you prefer coffee already ready to dose, find our selection of organic ground coffee.
• The Harmonieux is also available as a quality ground coffee.
• For a more intense cup without having to grind the beans, discover our Puissant 250g ground coffee.
• The Colombia recipe is also available as Colombia ground coffee.
• To complement your preparation, you can browse our selection of coffee accessories.
• If you wish to compare several profiles, a coffee gift set allows you to discover several recipes.
• Finally, you can find all our products in the general collection.

Do you use pre-ground coffee? Our guide on different types of ground coffee machines helps you choose a suitable method.

Key takeaways

Roasting transforms green coffee and largely builds its cup profile. Drying, temperature increase, first crack, and development must be controlled to find the right balance.

A light roast tends to leave more room for liveliness and the bean's characteristics. A darker roast progressively favors roasted notes, intensity, and bitterness.

The best choice therefore remains the one that matches your coffee, your brewing method, and your tastes.