Espresso is not just a way of making coffee. Espresso is the absolute perfection of coffee brewing, a harmonious balance of flavors and a king of versatility. Espresso is the basis for many coffee specialties, such as cappuccino, latte macchiato, or flat white. But espresso is also a pure delight on its own. Preparing espresso is an art in itself and requires a great deal of knowledge and experience. In this guide, you will learn everything you need to know about espresso.

What is the difference between coffee beans and espresso beans?

The short answer is: nothing at first. The beans do not come from a different coffee plant, nor are they grown differently. Beans from the same coffee bush can end up in both filter coffee and espresso. But what distinguishes beans for espresso and filter coffee is the roasting process—as well as a few details of the preparation. Espresso beans are roasted longer and darker than their filter coffee equivalent. This process involves many highly complex chemical reactions that are responsible for the explosive aroma of the little black coffee.

Espresso is a special way of preparing coffee using high pressure and high temperature. To make the perfect espresso, it is essential to use the right coffee beans. The beans should be freshly roasted and ground to release their full aroma. The choice of beans depends on personal preference. There are many different varieties, which differ in taste, aroma, and intensity. The best-known varieties are Arabica and Robusta. Arabica beans are milder and fruitier, while Robusta beans are stronger and more bitter. Blends of both varieties are often used for a classic espresso.

Coffee beans must be roasted (refined) before grinding. The roasting process creates the characteristic flavor, which consists of an incredible number of complex individual aromas. The beans are heated raw and dry, i.e., without the addition of any liquid. From the moment the bean bursts (first crack), the caramelization phase begins—however, the aromas are developed much earlier.

The final roast is basically a function of the roasting time and the roasting temperature—these two parameters allow the roaster to determine the result. In addition, there are also two main roasting methods that influence the quality of the roast:

Temperature:
The roasting temperature determines how the chemical reactions in the beans proceed. Too low temperatures can lead to a flat taste, while too high temperatures can cause bitterness.

Roasting time:
The duration of the roasting process influences the development of aromas. A shorter roasting time preserves more acidity and fruitiness, while a longer roast can bring out deeper, chocolatey notes.

Air flow:
Good air circulation ensures that the beans are heated evenly, resulting in consistent roasting.

Moisture content of the beans:
Irregular moisture distribution can lead to uneven roasting.

Cooling process:
The speed at which the beans cool down after roasting affects the stability of the aromas.

Type of roasting process:
Drum roasting, hot air roasting, and other methods each have different effects on flavor and consistency.

Drum roasting
In drum roasting, the beans are roasted slowly at a moderate temperature. This gives the aromas time to fully develop and ensures that the beans are roasted all the way through to the core. Drum roasting only works with small quantities and is a mark of quality, usually found in small, family-run traditional roasteries.