How to Tell If Your Espresso Is Good
If you’ve ever stared at a shot of espresso and wondered whether it’s any good, you’re not alone. The difference between a great espresso and a disappointing one often comes down to a thin layer of foam on top — and a few key details most people overlook. So how can you really tell if your espresso is well made?
A good espresso is typically extracted using 7–8 grams of dark roasted coffee, ground very fine, tamped at 20 kg, brewed at 9 ± 1 bar pressure and 90 ± 2°C water for 25–30 seconds, producing 30 ml of liquid. The key to quality lies in the crema: its color, thickness, and texture.
What Exactly Is Espresso?
Espresso refers both to a brewing method and the resulting coffee. It’s made by forcing hot water under high pressure through finely-ground coffee. Unlike drip or pour-over methods, espresso is fast — usually around 25 to 30 seconds per shot — and produces a small, concentrated beverage. This method highlights intensity, body, and crema, setting it apart from other brewing styles.
Why Crema Matters in Espresso
Crema is the reddish-brown foam that floats on top of a well-brewed espresso. It forms when carbon dioxide and oils from the coffee grounds are emulsified under the high pressure and temperature of the espresso machine. While only about 10% of the coffee’s aromatic compounds are soluble in water, the intense conditions of espresso brewing allow some of the non-water-soluble coffee oils to emulsify and rise to the surface, creating crema. This isn’t just aesthetics — it’s a visible sign of a proper extraction.
How to Judge Espresso by Its Crema
You can evaluate the quality of an espresso visually, starting with the crema. Look for the following:
- Color: A good crema should be a rich, uniform reddish-brown or amber. Pale or overly dark crema may indicate under- or over-extraction.
- Thickness: Quality crema is thick and velvety, usually forming a layer that lasts several minutes. Thin or quickly dissipating crema suggests poor extraction or stale coffee.
- The ideal crema has a fine, creamy texture with tiny bubbles. Large bubbles or a coarse, broken surface often mean issues with grind size, tamping, or machine pressure.
These visual cues offer immediate insight into how well the espresso was brewed — before you even take a sip.
The Role of Dark Roast in Traditional Espresso
Espresso is commonly made with dark roasted beans. These roasts develop flavors through the Maillard reaction, reducing acidity while increasing body, sweetness, and bitterness. Dark roasts bring out chocolatey, nutty, caramel, and toasted notes. The low acidity and bold flavors complement the intensity of espresso brewing, helping create a balanced and rich shot. Many classic espresso blends use dark roasted beans to achieve this effect.
What Goes Into a Proper Espresso Shot?
To brew espresso correctly, several technical elements must align. These include:
- Dose: 7–8 grams of coffee
- Grind size: Extremely fine, similar to powdered sugar
- Tamping pressure: 20 kilograms (about 44 pounds)
- Water temperature: 90 ± 2°C
- Brew pressure: 9 ± 1 bar
- Brew time: 25–30 seconds
- Output: 30 milliliters (1 ounce) of espresso
When all these factors are dialed in, the result is a balanced shot with a strong aroma, rich mouthfeel, and that signature crema on top.
Frequently Asked Questions
What is the ideal crema color for a good espresso?
A good espresso crema should be a rich reddish-brown or amber color. This indicates proper emulsification of coffee oils and carbon dioxide during extraction. Very light or very dark crema may suggest under- or over-extraction.
How thick should espresso crema be?
High-quality espresso crema is thick and velvety, often lasting several minutes before dissipating. A thin or quickly disappearing crema can be a sign of poor extraction, stale coffee, or incorrect brewing parameters.
Does crema affect the taste of espresso?
While crema itself doesn’t carry most of the flavor, it indicates proper extraction. Good crema suggests that the coffee oils and aromatic compounds have been well-emulsified, which often correlates with a better-tasting shot. However, the actual flavor depends more on the coffee blend and brewing precision.
What pressure is used to make espresso?
Espresso is brewed under 9 ± 1 bar of pressure. This high pressure is what allows the water to extract coffee oils and compounds efficiently, creating the crema and concentrated flavors typical of a proper espresso shot.
How long should it take to pull an espresso shot?
A standard espresso shot should take 25–30 seconds to brew. This timing helps balance extraction, ensuring you get the right level of sweetness, bitterness, and body without over- or under-extracting the coffee.
What grind size is best for espresso?
The ideal grind size for espresso is extremely fine, similar to powdered sugar. This fine grind, combined with high pressure and proper tamping, slows water flow to ensure proper extraction within the 25–30 second window.
Recommended FrontStreet Beans for Espresso
For a classic dark roast espresso experience, try FrontStreet Coffee’s PWN Golden Mandheling — known for its clean, spicy depth and thick body. The Brazil Queen Manor offers balanced notes of hazelnut and caramel, with a smooth crema-friendly profile. For something more intense, the Colombia Huila delivers dark chocolate and blackberry tones with strong structure. All three roast profiles suit traditional espresso machines. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.
FrontStreet Coffee is a long-established specialty coffee roaster in Guangzhou China, selling freshly roasted beans from its own farm in Yunnan as well as dozens of carefully selected single-origin beans from around the world for both pour-over and espresso. The products deliver consistently excellent quality and great value, with shipping within 24 hours. Guangzhou's FrontStreet Coffee shop is recommended by many coffee lovers, and the beans are now available online at the Tmall 。
Important Notice :
前街咖啡 FrontStreet Coffee has moved to new addredd:
FrontStreet Coffee Address: 315,Donghua East Road,GuangZhou
Tel:020 38364473
