Coffee beans: roast level and origin explained
The best machine will not make good espresso from the wrong beans. Whether a coffee tastes bright and fruity or chocolatey and strong depends mainly on three things: the coffee species, the roast, and the origin with its processing. Here you will find out what matters and which beans suit which drink.
Arabica or robusta?
| Arabica | Robusta | |
|---|---|---|
| Taste | complex, fine acidity, fruity to chocolatey | strong, bitter, earthy, low acidity |
| Caffeine | about 1–1.5 % | about twice as much |
| Crema | fine | dense and stable |
| Typical use | specialty coffee, single origins, espresso | in Italian espresso blends for body and crema |
Arabica makes up most of world production and is regarded as the finer species. Robusta has a worse reputation than it deserves: in small proportions it gives a classic Italian espresso body, strength and a dense crema.
The roast level
During roasting the beans pass through two audible points: at "first crack" they pop like popcorn as water vapour escapes. If roasting continues, "second crack" follows and oils rise to the surface.
| Light | Medium | Dark | |
|---|---|---|---|
| End of roast | during or just after first crack | between first and second crack | from second crack |
| Acidity | bright, fruity, lively | balanced | low |
| Body | light, tea-like | medium | full, heavy |
| Aromas | fruit, flowers, citrus – the origin takes centre stage | caramel, nuts, chocolate, with some fruit | dark chocolate, roasted notes, smoky |
| Surface | dry | dry to slightly glossy | oily |
| Best for | filter coffee, straight espresso for connoisseurs | espresso straight and with milk, the all-rounder | espresso with milk, classic Italian |
A common misconception: a dark roast does not mean more caffeine. The difference between light and dark is small. The coffee species has far more influence – robusta contains about twice as much caffeine as arabica.
For hospitality: most guests drink cappuccino, latte and flat white. A medium to medium-dark roast is ideal, as it holds its own against the milk. Light roasts show their strength when drunk straight, but are more demanding to dial in on the machine.
Processing: how the cherry becomes a bean
Coffee beans are the seeds of a cherry. How the fruit is removed shapes the taste almost as much as the origin.
| Method | How it works | Taste |
|---|---|---|
| Washed | the fruit is removed before drying | clear, clean, lively acidity, the origin comes through clearly |
| Natural | the whole cherry dries with the fruit | sweet, fruity, berries, often winey, more body |
| Honey | part of the fruit stays on the bean during drying | between washed and natural, sweet and round |
| Wet hulled | typical of Indonesia | earthy, spicy, heavy body, low acidity |
Growing countries and their taste
| Origin | Typical profile | Typical processing |
|---|---|---|
| Brazil | nutty, chocolatey, low acidity, soft body – the base of many espresso blends | mostly natural |
| Colombia | balanced, caramel, milk chocolate, mild citrus notes – the ideal starting point | mostly washed |
| Guatemala | cocoa, caramel, spices, structured acidity | mostly washed |
| Ethiopia | washed: floral, jasmine, lemon, tea-like; natural: blueberry, berries, winey | washed and natural |
| Kenya | intense and juicy, blackcurrant, winey, lively acidity | mostly washed |
| Indonesia (Sumatra, Java, Sulawesi) | earthy, spicy, tobacco, heavy body, low acidity | wet hulled |
| India and Vietnam | a lot of robusta: strong, bitter, plenty of body and crema | varies |
These are typical tendencies. Altitude, variety, processing and of course the roast can make the same origin taste very different.
Single origin or blend?
- Single origin comes from one country, often even from one region or farm. Ideal for enjoying a particular character on its own.
- Blends combine several origins. For espresso they are often the better choice, because the roaster can balance sweetness, body and acidity precisely and the taste stays more consistent through the year. A classic base is Brazil for body and chocolate, complemented by Central America or Africa for freshness.
Freshness and storage
- Check the roast date: for espresso, beans are usually at their best about one to three weeks after roasting. Straight after roasting they still release a lot of gas; after a few weeks they lose aroma.
- Buy whole beans and grind them just before brewing. Ground coffee loses its aromas within minutes.
- Store them cool, dry, dark and airtight, not in the fridge. Only fill the grinder hopper with as much as you need for a day or two.
Frequently asked questions
Which beans are best for espresso?
There is no single best bean, only the right one for you. For espresso with milk, medium to medium-dark roasts with chocolate and nut notes work well, for example from Brazil or Colombia. If you like your espresso straight and fruity, try a light roast from Ethiopia or Kenya.
Does dark coffee have more caffeine?
No. The difference between light and dark is small. What matters is the species: robusta contains about twice as much caffeine as arabica.
Why does the same coffee sometimes taste sour and sometimes bitter?
Often it is not the bean but the preparation: grind size, dose, temperature and water. If the espresso runs too fast it tastes sour; if it runs too slowly it tastes bitter. Water plays a big part too – more in the water guide.
Do I have to use a particular coffee with Espressoklinik?
No. Our machines are not tied to any type of coffee. You choose your roaster freely and we set the machine up for your beans.
The right machine
We set up the Izensso and ACS portafilter machines for your beans.