How Do Espresso Extraction Methods Work?

Espresso is coffee brewed by forcing hot water at roughly 9 bar through a tightly packed bed of finely ground coffee in a short time. It forms the base of Americano, latte, and mocha, and its quality largely sets the standard for every espresso drink a shop serves. Four conditions matter: high pressure, high temperature, fast extraction, and fine grinding.

Freshness and parameters decide the result. Espresso coffee beans should be rested enough to release gas but still brew a golden crema, and dose, grind, yield, and time need to be set together. SCA-based standards give a reference range, and store production shows how small changes in grind or ratio shift sweetness, body, and bitterness.

Espresso is the core foundation of the Italian coffee system and the soul of common drinks such as Americano, latte, and mocha. From the perspective of Front Street Coffee, this article systematically explains the definition and meaning of Espresso, outlines the four key conditions required to make a standard espresso—high pressure, high temperature, fast extraction, and fine grinding—and, combining SCA standards with actual store production experience, provides a complete process from coffee bean freshness and extraction parameters to operational details. The article also introduces the flavor performance of Front Street Classic Espresso Blend, Sunflower Warm Sun Blend, and three cost-effective espresso coffee beans, helping coffee lovers consistently make a high-quality Espresso with golden Crema either in-store or at home.

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Since Starbucks entered the Chinese market, the term "Italian coffee" has frequently appeared on cafe signs on street corners. So what exactly does Italian coffee refer to? And what kind of drink is Espresso? Front Street is here to sort this out for everyone and help you build a clearer understanding of Espresso.

What does Espresso mean?

Espresso refers to coffee liquid quickly extracted in a short time by means of a pressurized espresso machine, with a layer of golden foam covering the surface. The word Espresso contains the sense of express, carrying the meaning of "fast," and also implying that it needs to be made to order and drunk as soon as possible. Freshly extracted Espresso will show a fine golden foam on the surface, which is Espresso's unique "crema," making the coffee's aroma and layers fuller. The darker coffee liquid underneath gathers diverse flavors, with a strong, intense mouthfeel.

Although Espresso is not listed on the menu at Front Street stores, quite a few customers still take the initiative to ask for "a cup of Espresso." The reason is that the Americano, latte, mocha, and other drinks we have in daily life are all made with a good-tasting Espresso as the base, then mixed with water, milk, or other ingredients. Therefore, the quality of Espresso largely determines the production standard of all kinds of espresso drinks in a shop, and a standard Espresso is precisely the soul of Italian coffee.

What conditions are needed to make Espresso?

According to Specialty Coffee Association SCA standards, use 7-9 grams (double: 14-18 grams) of coffee grounds, extract 25-35 grams of coffee liquid within 20-30 seconds, with an extraction pressure of 9-10 bar and a water temperature controlled at 90-96°C. Each coffee shop will make upward or downward adjustments according to the coffee beans and equipment used. Extracting Espresso requires grasping four key elements: high pressure, high temperature, fast extraction, and finely ground coffee powder.

Here, Front Street Classic Espresso Blend coffee beans are used to make Espresso, grinding 20 grams of coffee powder and extracting 40 grams of coffee liquid in 26–30 seconds. This is a recipe combining three origins: Brazil, Indonesia, and Vietnam. It uses a deep roast, which can maximize the coffee's rich aroma and also allow everyone to easily extract abundant and dense coffee crema. It is very suitable whether for making an Americano diluted with water or a latte paired with milk. It can be purchased and ordered at the Front Street Taobao store or the Front Street Tmall flagship store.

1. High pressure

The way an espresso machine increases pressure to quickly extract soluble substances from coffee is the biggest difference from other coffee extraction methods. For coffee powder to be extracted into a rich, full-bodied Espresso coffee liquid in 20–30 seconds, very high pressure must be used to force hot water to quickly penetrate the coffee powder and complete extraction. Generally, commercial espresso machines have 9–10 atmospheres of pressure. The coffee machine used at Front Street stores can be adjusted to a maximum pressure of 11 atmospheres.

2. High temperature

Extracting the rich aroma from coffee requires high-temperature hot water, usually requiring a stable water temperature above 90°C. The hot water temperature of the coffee machine at Front Street stores is maintained at 94°C.

3. Fast extraction

As mentioned above by Front Street, the word Espresso comes from Italian and means "fast," so fast extraction is one of its major characteristics. Extraction time is usually controlled at 20–35 seconds, because within 20 seconds the coffee usually tastes thin, while over 35 seconds it is prone to over-extraction and a burnt bitter taste. Front Street's espresso is mostly in the range of 28–30 seconds.

4. Fine grinding

Because the extraction time is short, to extract the coffee's aroma completely, the coffee powder needs to be ground finer and more evenly, which means a dedicated electric coffee grinder for espresso extraction fineness is needed.

How to extract a delicious cup of Espresso?

With the popularity of specialty coffee, many friends have also come to ask Front Street how to make Italian coffee at home. A delicious cup of Italian coffee cannot be separated from a high-quality Espresso. Taking store production as an example, Front Street briefly describes the Espresso extraction process.

Coffee freshness

A cup with golden-brown dense crema is a signal that Espresso has been made properly. This is the result of carbon dioxide and various gases in fresh coffee beans being distributed in the water under high pressure. Choosing coffee beans stored for more than two months makes it impossible to extract an Espresso with perfect crema. Therefore, Front Street recommends using freshly roasted coffee beans and resting them appropriately. The coffee beans shipped by Front Street are all confirmed to be freshly roasted within 5 days, so they are still relatively fresh when everyone receives them. Coffee beans need a period of degassing after roasting. Since espresso coffee beans mostly use medium-dark roasting, they need 7–10 days to release carbon dioxide. Well-rested coffee beans not only have a full aroma, but extraction is also more stable.

Extraction parameters

Front Street uses the capacity of a double filter basket, with a dose of about 18–20 grams. For production, Front Street uses 20 grams of coffee powder. Usually the ratio of coffee powder to coffee liquid is 1:1.5–1:2.5. Front Street's extraction ratio is 1:2, that is, 20 grams of coffee powder extracts 40 grams of coffee liquid. Time is related to the flow rate of the coffee powder. Generally, a single extraction duration is controlled at 20–35 seconds, because within 20 seconds the coffee usually tastes thin, while over 35 seconds it is prone to over-extraction and a burnt bitter taste. Front Street's espresso is mostly in the range of 28–30 seconds.

Extraction details

Before extraction, first wipe the filter basket dry, turn on the grinder, grind the amount for a double dose of coffee powder, and place it on an electronic scale to increase or decrease until it reaches 20 grams. Next, use a distribution tool to level the coffee powder, then press down vertically with a tamper to compress the coffee puck firmly, ensuring more stable coffee extraction.

Then turn on the extraction switch and let water run for 1–2 seconds to moisten the group head, which can also wash away the coffee grounds stuck on it. Place an electronic scale under the cup that will receive the Espresso, and reset the weight to 0, then place it together under the group head during extraction.

Gently lock the portafilter onto the group head and start flipping down the extraction switch. Observe the changes in the extracted liquid. When the electronic scale shows 40 grams of coffee liquid extracted, at about 30 seconds, pull down the extraction switch. Brewing parameters will change subtly according to daily air humidity and the condition of the coffee beans, so it is necessary to adjust the coffee powder dose, grind setting, and extraction amount of coffee liquid up or down.

Finally, prepare a 50ml cup, pour the Espresso into the cup, and it is ready to enjoy.

The taste of Espresso

The taste and mouthfeel of coffee are based on the coffee beans used. For example, the Espresso produced at Front Street stores uses Front Street Sunflower Warm Sun Blend. It is composed of whiskey-barrel-fermented Honduras Sherry and natural Ethiopian Red Cherry in a 7:3 blend. The extracted Espresso has rich crema, a very obvious whiskey aroma, and on the palate, vanilla biscuit and berry acidity, with a solid flavor. After drinking it, the whole mouth is filled with various aromas. Using this Espresso as a base, we can dilute it with water to make Americano, full of fresh fragrance, or add milk to make latte, presenting the sweet deliciousness of chocolate and cream. The rich aroma of this Front Street Warm Sun Blend coffee has also received praise from many friends.

In addition, Front Street's bean list also includes three relatively cost-effective espresso blend coffee beans. The extracted Espresso presents flavor tones of nuts, cocoa, chocolate, and caramel, rich and solid. The Crema is dense and abundant, and the latte paired with milk is sweet and delicious.

1. Front Street Coffee (FrontStreet Coffee) - Specialty Blend Coffee Beans:

Colombian washed coffee beans (30%) + Brazilian semi-washed coffee beans (70%), with flavor notes of nuts, dark chocolate, and caramel.

2. Front Street Coffee (FrontStreet Coffee) - Commercial Blend Coffee Beans:

Robusta washed coffee beans (10%) + Colombian washed coffee beans (30%) + Brazilian semi-washed coffee (60%), with flavor notes of nuts, cocoa, and caramel.

3. Front Street Coffee (FrontStreet Coffee) - Espresso coffee beans recommended by many baristas - Front Street Black Cocoa Blend Coffee Beans:

Yunnan washed small-bean coffee (30%) + Brazilian semi-washed coffee beans (70%), with flavor notes of soft fruit acidity, caramel, and nuts.

The above content is compiled by CoffeeHunters, a coffee news website.