Expresso coffee methods

What Is Espresso and Why Does the Choice of Coffee Matter?

Definition and Basic Principles of Espresso Extraction

Espresso is more than just a drink: it is a brewing method in its own right. Hot water, generally between 90°C and 96°C, is forced through finely ground coffee under pressure. A traditional espresso extraction typically operates at around 9 bars at the coffee puck and takes approximately 25 to 30 seconds, although the ideal recipe varies depending on the coffee, dose and desired result.

This process produces a small, concentrated cup with remarkable aromatic intensity, body and texture.

Why Does the Choice of Coffee Directly Influence Your Espresso?

The concentrated nature of espresso extraction makes the characteristics of the coffee particularly noticeable. Origin, variety, processing, roasting and freshness can all have a significant impact on the final cup.

A carefully selected specialty coffee can reveal remarkable aromatic complexity as espresso, from chocolate and caramel to fruit, flowers and spices. Choosing the right coffee is therefore one of the foundations of a successful extraction.

Arabica, Robusta or Blend: Which Coffee Beans Should You Choose for Espresso?

The species and composition of your espresso coffee beans influence aroma, body, bitterness, crema and caffeine content. Arabica and Canephora – commonly known as Robusta – offer very different characteristics, while blends can combine elements of both.

Arabica: Sweetness, Aromatic Complexity and Vibrant Acidity

A 100% Arabica espresso can reveal remarkable aromatic complexity, with flavour profiles ranging from chocolate and caramel to berries, jasmine, citrus or bergamot depending on the origin, variety and processing method.

Arabica is particularly important in the world of specialty coffee, where the objective is often to highlight the distinctive characteristics of an individual terroir.

Robusta: Intensity, Full Body and Generous Crema

Robusta coffee – more precisely Canephora – generally contains more caffeine than Arabica and can contribute considerable body, bitterness and crema to espresso.

Its distinctive texture and intensity explain why it remains an important component of many traditional espresso blends, particularly for coffee drinkers looking for a powerful and full-bodied cup.

Espresso Blends: Finding the Right Balance

A carefully designed espresso blend can combine the aromatic complexity and sweetness of Arabica with the structure, intensity and crema associated with Canephora.

However, there is no universal formula for the ideal espresso. A 100% Arabica single origin, an Arabica blend or an Arabica-Canephora blend can all produce excellent results depending on the desired flavour profile.

Which Roast Profile Is Best for Espresso Coffee?

Roast profile has a major influence on the way an espresso tastes. A lighter roast can preserve more of the floral, fruity and vibrant characteristics associated with the coffee's origin, although it may require careful extraction to achieve balance.

A medium roast can offer greater body and sweetness, with flavours such as caramel, chocolate and dried fruit becoming more prominent. Darker roasts tend to emphasise roasted, bitter, smoky and caramelised characteristics, potentially reducing the perception of more delicate origin flavours.

At Terres de Café, our coffees are artisanally roasted in France, near Paris, with roast profiles adapted to the characteristics of each origin and the desired expression in the cup.

Whole Bean or Ground Coffee: Which Is Best for an Espresso Machine?

For greater control over espresso extraction, whole bean coffee offers a significant advantage: you can adjust the grind immediately before brewing according to the coffee, machine and extraction time.

The Benefits of Whole Bean Coffee for Espresso

Grinding your coffee beans immediately before brewing helps preserve aromatic freshness and allows you to adjust the grind size precisely.

This is particularly important for espresso, where even a relatively small change in grind size can noticeably affect flow rate, extraction time and flavour.

How to Adjust Your Grind for Better Espresso Extraction

If the coffee grind is too coarse, water may pass through the coffee bed too quickly, producing a thin and under-extracted espresso. If it is too fine, the flow can become excessively slow and the resulting cup may develop unwanted bitterness or astringency.

A useful starting point for a traditional espresso recipe is an extraction of approximately 25 to 30 seconds, but the final decision should always be guided by taste rather than extraction time alone.

Adjust your grinder gradually, keeping the other variables as consistent as possible, until you achieve the balance of sweetness, acidity, body and bitterness you are looking for.

Pre-Ground Coffee: What Should You Choose for Your Portafilter?

• Pressurised portafilter: generally more forgiving of variations in grind size and can work with pre-ground espresso coffee.
• Non-pressurised portafilter: requires a finer and more consistent grind, making freshly ground coffee particularly useful.
• Pre-ground coffee: remains a convenient option, but choose appropriate espresso grind size and packaging designed to preserve freshness.

Organic Espresso Coffee: Quality, Traceability and Environmental Considerations

Organic coffee is produced according to regulated farming standards that restrict the use of synthetic pesticides and fertilisers. Organic certification relates primarily to agricultural production methods and should not be confused with a guarantee of flavour or sensory quality.

At Terres de Café, selected organic coffees are also produced within agroforestry systems, where coffee trees grow alongside other plant species. These diversified systems can contribute to biodiversity, soil health and greater ecosystem resilience when appropriately managed.

Organic coffee and specialty coffee can also go hand in hand. Sensory quality ultimately depends on numerous factors, including terroir, variety, harvesting, processing, roasting and extraction.

How to Match Your Coffee to Your Espresso Machine

Pressurised Portafilter Machines: Which Ground Coffee Should You Use?

Entry-level espresso machines equipped with a pressurised portafilter are generally more forgiving when it comes to grind consistency. A medium-fine to fine espresso grind can provide a useful starting point, depending on the machine.

Pre-ground coffee can work well with these systems, but freshly ground espresso coffee still gives you greater control over freshness and extraction.

Prosumer and Professional Espresso Machines: Grind and Coffee Requirements

Prosumer and professional espresso machines offer much greater control over extraction and therefore benefit from a precise, consistent grinder.

Freshly roasted specialty coffee beans can evolve over time, and grind settings may need to be adjusted as the coffee ages or environmental conditions change. Temperature, humidity and the characteristics of the beans can all influence how the coffee behaves during grinding and extraction.

Key Espresso Settings: Dose, Tamping and Water Temperature

Three important parameters to consider when preparing espresso are:

• Dose: around 18–20 g is a common starting point for a double espresso, depending on the basket and recipe.
• Tamping: aim for a level, consistent coffee bed rather than focusing on an exact pressure figure.
• Water temperature: approximately 90–96°C provides a useful working range, with adjustments depending on the coffee and roast profile.

These figures are starting points rather than fixed rules. The ideal recipe is the one that produces the most balanced and enjoyable result for the coffee you are preparing.

Coffee Origins and Flavour Profiles: Which Espresso Coffee Suits Your Taste?

Origin can provide useful clues about the flavours you may encounter, although variety, altitude, processing and roasting also play essential roles.

Latin American coffees are often appreciated in espresso for their sweetness, balance and chocolate or nutty characteristics. African coffees can produce particularly expressive espressos with floral, citrus or berry notes.

Asian and Pacific origins cover an extremely diverse range of coffees, from complex Arabicas to powerful Canephoras that can contribute body and intensity to an espresso blend.

Freshness, Storage and Buying Tips for Better Espresso Coffee

Why Roast Freshness Matters for Espresso

Freshly roasted coffee releases carbon dioxide after roasting in a process known as degassing. For espresso, coffee often benefits from a resting period before extraction, as excessively fresh beans can make brewing less predictable.

There is no universal ideal number of days after roasting. The optimal window depends on the coffee, roast profile, packaging and extraction method. Some coffees perform beautifully after a relatively short rest, while others continue to develop over several weeks.

Rather than relying on a fixed rule, use the roast date as a reference and adjust your grind and recipe as the coffee evolves.

How to Store Whole Bean and Ground Coffee

• Store your coffee beans in an airtight or well-sealed container or their original resealable coffee bag.
• Keep coffee away from direct sunlight, heat and moisture.
• Store it at a stable room temperature for everyday use.
• Grind only the amount of coffee you need whenever possible.
• If using pre-ground coffee, reseal the packaging carefully after each use to limit exposure to air.

Good storage helps preserve aromatic freshness and makes it easier to achieve consistent, expressive espresso from one extraction to the next.