A good espresso is not a matter of luck — it comes down to a handful of variables you can learn to control. Grind size, dose, extraction time, bean selection: each one shapes what ends up in the cup. If you want to understand what to adjust and which mistakes to stop making, you are in the right place.
What is espresso and where does it come from?
Espresso is a concentrated coffee beverage brewed under high pressure in a short time — typically around 25–30 seconds. It is defined by its intense flavour, thick body, and a layer of light-brown crema on the surface.
Its origins go back to the turn of the 19th and 20th centuries in Italy, where the growth of industrial technology created demand for a fast, made-to-order coffee. The first pressure-driven espresso machines were developed there, and the method they introduced became the foundation of coffee culture — not only in Italy, but across the world.
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Espresso: from Italian tradition to the specialty approach
Espresso is strongly associated with Italian tradition, but today there are two distinct approaches to how it is prepared.
The classic Italian standard — defined by the INEI (Istituto Nazionale Espresso Italiano) — is highly specific. It calls for around 14 g of coffee for a double shot, producing 45–55 ml of beverage in approximately 25 seconds. The focus is on consistency and a characteristic, intense flavour profile.
In the specialty coffee world, the more common reference is the Specialty Coffee Association (SCA) framework, which is considerably more flexible. Instead of fixed volumes, it works with a brew ratio — most often 1:2, meaning 18 g of coffee yields roughly 36 g of beverage. This makes it easier to adapt parameters to a specific bean and get the best possible result. Brew temperature also varies: lighter roasts generally benefit from higher temperatures, darker roasts from lower ones.
| Parameter | INEI (Italian standard) | SCA (specialty coffee) |
|---|---|---|
| Approach | Fixed, predefined parameters | Flexible, adapted to the coffee |
| Dose (double shot) | approx. 14 g | approx. 16–20 g (depending on setup) |
| Beverage volume | 45–55 ml | Determined by ratio (e.g. ~36 g from 18 g coffee) |
| Brew ratio | Fixed volume | Typically 1:2 (e.g. 18 g → 36 g) |
| Extraction time | approx. 25 seconds | approx. 25–30 seconds (more flexible) |
| Temperature | 86–90°C | 90–96°C |
| Adaptability to beans | Limited | High (works across different roast profiles) |
| Result in the cup | Classic, intense espresso | More varied, matched to the bean |
| Best for | Fans of traditional espresso | Those who enjoy experimenting with flavour |
Types of espresso – what are they and how do they differ?
Espresso is often thought of as a single, fixed drink — but in practice it comes in several variants, each differing in ratio, extraction time, and intensity. Small adjustments can produce a completely different experience from the same beans, ranging from the concentrated punch of a ristretto to the milder character of an americano. Below is a quick overview of the most common types.
| Type | What is it? | Character |
|---|---|---|
| Ristretto | Short espresso (less water) | More intense, dense, less bitter |
| Espresso (normale) | Classic espresso | Balanced, intense, approx. 25–30 ml |
| Doppio | Double espresso | Larger volume and more caffeine (approx. 50–60 ml) |
| Lungo | Extended espresso (more water) | Lighter, more bitter, less intense |
| Americano | Espresso + hot water | Milder, similar in feel to filter coffee |
| Espresso macchiato | Espresso with a dash of foamed milk | Still intense, slightly softened |
| Cortado | Espresso + warm milk (1:1) | Creamier, balanced, less intense |
What affects the taste of espresso?
Several variables shape the flavour of espresso — and each one can shift the result in the cup:
- Grind size — controls how fast water flows through; too coarse gives acidity, too fine gives bitterness.
- Brew ratio — the amount of coffee relative to the beverage output (e.g. 1:2) determines intensity and balance.
- Extraction time — too short produces an under-extracted shot; too long brings out bitterness.
- Water temperature — higher temperatures increase extraction (and can amplify bitterness); lower temperatures slow it down.
- Bean quality and freshness — freshly roasted coffee produces a fuller, more aromatic shot.
- Roast level — lighter roasts tend toward brightness and acidity; darker roasts toward bitterness and chocolate notes.
- Tamping — uneven pressure causes channelling, where water takes the path of least resistance through the puck.
- Equipment cleanliness — coffee residues and oils left in the machine will affect both aroma and taste.
Read also: Coffee grind size and flavour – how to grind correctly for different brew methods
Which specialty coffee works best for espresso?
The best specialty coffee for espresso combines freshness, a suitable flavour profile, and compatibility with the brew method. In practice, look for beans that perform consistently in the machine — delivering a stable extraction and a clear, readable flavour, whether you are drinking the espresso straight or using it as the base for milk drinks.
At JAVA Coffee Roasters you will find both classic, chocolate-and-nut-forward profiles and more modern, fruit-led options:
- Brazil Cerrado — smooth and well-balanced, with notes of chocolate, nuts, and caramel; an excellent starting point for classic espresso.
- Guatemala Santa Rosa — a balanced coffee with a deep chocolate character, featuring notes of sweet plum, walnut, and cocoa.
- Classic Espresso Blend 001 — a reliable blend with a stable, chocolate-caramel profile; well suited to everyday espresso and milk-based drinks.
- JAVA Espresso Blend 002 — a more complex blend, combining sweetness with a light fruit note; a good choice for those looking for something beyond the classic.
If you are new to espresso, espresso blends are the more forgiving starting point — they are consistent and more tolerant of small extraction errors. Once you have a feel for the process, single origins will open up more complex and distinctive flavour profiles.
One factor matters above all: freshness. Even the best coffee cannot show its full potential if it is not freshly roasted. At JAVA Coffee Roasters, all beans are roasted no more than 7 days before dispatch.
How to make espresso at home (step by step)
Making espresso is a repeatable process built on precision. Even small deviations change what ends up in the cup. Here is how to approach it, step by step.
- Weigh your coffee. Start with approx. 18 g for a double shot (doppio). Precision matters — a difference of even 0.5 g affects the result.
- Grind just before brewing. The grind should be fine, but not powdery. This is the single most influential variable in extraction.
- Distribute evenly in the portafilter. Level the surface and break up any clumps — this ensures even water flow through the puck.
- Tamp evenly (tamping). Apply firm, level pressure — the puck surface should be perfectly flat.
- Set your machine parameters:
- Temperature: approx. 88–93°C
- Pressure: approx. 9 bar
- Start the extraction. The espresso should:
- begin to flow after a few seconds
- have a consistency resembling thick honey
- Monitor time and yield:
- Time: 25–30 seconds
- Ratio: approx. 1:2 (e.g. 18 g → 36 g in the cup)
- Evaluate the result. A well-made espresso should be:
- balanced — neither aggressively acidic nor bitter
- topped with a creamy, golden-brown crema
Espresso parameters: quick reference
| Parameter | Optimal value | What happens if you miss it? |
|---|---|---|
| Coffee dose | approx. 18 g (doppio) | Too little → watery; too much → bitter |
| Grind size | Fine | Too coarse → sour; too fine → bitter |
| Brew ratio | 1:2 | Disrupts flavour balance |
| Extraction time | 25–30 s | Too short → sour; too long → bitter |
| Temperature | 88–93°C | Too low → under-extraction; too high → bitterness |
| Pressure | approx. 9 bar | No crema, poor extraction |
Common espresso mistakes to avoid
The most frequent mistakes that undermine espresso quality:
- Wrong grind size — too coarse produces a sour, watery shot; too fine causes bitterness and over-extraction.
- No ratio control — brewing by eye leads to inconsistency and imbalanced results.
- Incorrect extraction time — too short means under-extraction (sourness); too long means over-extraction (bitterness).
- Uneven tamping — creates channelling, where water finds weak points in the puck and bypasses much of the coffee.
- Wrong water temperature — too low fails to extract fully; too high amplifies bitterness.
- Old or poorly stored beans — stale coffee loses its aroma and produces a flat, lifeless shot.
- Changing too many variables at once — adjusting multiple parameters simultaneously makes it impossible to identify what is working.
- Dirty equipment — coffee oils and residues left in the machine affect both aroma and taste.
How to drink espresso
Espresso is not a drink to rush. It is short and concentrated — and it rewards attention. Take a moment to notice the aroma before the first sip. Drink it in small sips, without hurrying, and let the flavours develop on the palate.
Some people stir the crema into the shot for a more even flavour — others leave it on top for texture. Either way, espresso is best drunk immediately after brewing: it loses temperature and aroma quickly. Traditionally it is served alongside a small glass of still water, which cleanses the palate before and after tasting.
On the question of sugar: classic espresso is drunk without, so you can experience the natural flavour of the bean. That said, there are no rules. A small amount of sugar, honey, or flavoured syrup is perfectly fine — especially with more intense or darker-roasted coffees. It is worth trying the espresso black first, though, before deciding whether it needs anything extra.
Read also: Coffee brewing accessories – a complete guide
Espresso coffee from JAVA Coffee Roasters
Great espresso starts with the beans — they are the biggest single factor in what ends up in the cup. At JAVA Coffee Roasters you will find freshly roasted specialty coffees that work well not only for espresso but also for filter methods and moka pot. Whether you prefer classic chocolate-and-nut profiles or something more fruit-forward, there is an option to match your taste and brewing style. If you want to make sure fresh coffee arrives regularly without thinking about it, a subscription takes care of that — so you can focus on what matters: the coffee itself.
Frequently asked questions
How much caffeine does an espresso contain?
A single espresso (approx. 25–30 ml) contains on average 60–80 mg of caffeine. Despite its intensity, it has less caffeine than a large filter coffee — the difference comes down to volume.
Can you drink espresso with milk?
Yes — espresso is the base for a wide range of milk-based drinks, from cappuccino to flat white. If you want to experience the full flavour profile of the beans, it is worth trying it straight first.
Why does my espresso taste sour?
The most common causes are under-extraction — either too short a brew time or too coarse a grind. Sourness can also come from the beans themselves, particularly with lighter roasts.
Why does my espresso taste bitter?
Bitterness usually signals over-extraction: the grind is too fine, the brew time is too long, or the water temperature is too high.
Can you make espresso without a pressure machine?
True espresso requires pressure, so a portafilter or fully automatic machine is the right tool. A moka pot produces a similar, intense brew — though technically it is not espresso.
Does crema indicate quality?
Crema is a useful indicator of freshness and correct extraction, but it does not guarantee a good espresso on its own. Flavour is always the final measure of quality.
What water should you use for espresso?
Filtered or bottled water with moderate mineral content works best. Water that is very hard or very soft can affect both the taste of the coffee and the condition of the machine over time.
Does espresso always need 25–30 seconds of extraction?
That range is a reliable starting point, but it is not a fixed rule. Depending on the beans and roast level, the ideal time may shift slightly. The real measure is balance in the cup.
