How Does an Espresso Machine Work Differently From Pour-Over?

Espresso and pour-over differ mainly in pressure. Espresso forces water through a compacted puck at roughly 9 bar, producing a small, concentrated shot in a short time. Pour-over relies on gravity and free-fall, so water passes through the grounds without pressure, giving a lighter body and clearer acidity. The same beans taste noticeably different under each method.

In the espresso workflow the basket is wiped dry, grounds are weighed to within about 0.1 grams, and the dose is distributed evenly before tamping. Uneven distribution creates dense and loose zones, so water extracts some areas more than others. Pour-over instead uses staged pouring, which gives the brewer direct control over contact time and flow.

When visiting a coffee shop, the menu often features both pour-over coffee and espresso; what exactly is the difference between the two? From the perspective of Front Street Coffee, this article systematically outlines the 9-bar pressure extraction process of espresso and the pressure-free free-fall extraction method of pour-over coffee, comparing their respective characteristics and suitable scenarios. It also details the three-stage pouring technique for pour-over and, using Front Street Ethiopia Washed Yirgacheffe G2 as an example, provides specific brewing parameters and flavor descriptions to help beginners build an understanding of regional flavors and find the type of coffee that suits them.

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Nowadays, when walking into most coffee shops, the menu usually lists both espresso and pour-over coffee categories. Friends who don't drink coffee often are often confused: it's all a cup of coffee, so what exactly is the difference? Front Street Coffee (FrontStreet Coffee) will now explain the characteristics of each of these two types of coffee.

Espresso So-called espresso refers to coffee made with an espresso machine, and the concentrated liquid that flows directly from the machine is called Espresso. Using it as a base and adding different ingredients gives rise to many coffee varieties—for example, adding milk makes a latte, and adding water makes an Americano. These are collectively called espresso drinks. The most prominent feature of espresso is that it relies on 9 bars of pressure to extract a very concentrated small cup of coffee in a short time.

How is espresso made?

Step 1: Remove the portafilter basket and wipe it. Before weighing coffee grounds each time, wipe the portafilter basket to ensure it is dry and free of water marks.

Step 2: Weigh the coffee grounds. Use an electronic scale to accurately weigh the coffee grounds, with a deviation of plus or minus 0.1 grams. For today's dial-in, the dose was adjusted to 19 grams.

Step 3: Distribute the grounds. Use your hand or a distribution tool to evenly distribute the coffee grounds, making the coffee grounds in the portafilter basket as evenly distributed as possible. Uneven distribution will cause inconsistent density in the puck: the part with more grounds is denser, making it harder for water to extract; similarly, the part with fewer grounds is looser, making it easy for water to extract too much.

Step 4: Tamp. Use a tamper to accurately tamp the coffee grounds, avoiding a tilted puck with uneven height.

Step 5: Extract. Gently lock the portafilter into the coffee machine and start the extraction switch as soon as possible to extract the espresso, in order to avoid the high temperature of the machine accelerating the evaporation of coffee flavor compounds. At the same time, use an electronic scale to accurately weigh the amount of espresso liquid and record the extraction time. After today's dial-in, Front Street Coffee (FrontStreet Coffee) extracted 38 grams of coffee liquid, that is, a 1:2 coffee-to-liquid ratio, in 27 seconds.

Step 6: Clean. Turn off the extraction switch. After stopping extraction, remove the portafilter and release some water to rinse the group head.

Pour-over coffee Pour-over coffee is also a method of extraction, but it relies on free fall under no pressure. Throughout the process, the speed at which water passes through the coffee grounds directly determines the extraction result. The filter paper separates the coffee grounds from the coffee liquid, ultimately producing a clean and delicious cup of black coffee.

The greatest feature of pour-over coffee is that it can present the flavor of the coffee beans themselves in a fairly original way. No matter which coffee beans are used, their flavor can be brewed by pour-over. In addition, compared with espresso machines, pour-over is clearly much more convenient to operate. For this reason, coffee shops often offer a variety of beans for pour-over coffee, while the beans used for espresso are mostly fixed by the shop.

Front Street introduces a relatively common brewing method called "three-stage pouring." Simply put, it divides the entire pouring process into 3 parts. This includes the first stage, the bloom pour. Taking the brewing of Front Street Colombia Huila Washed Caturra as an example, the parameters used by Front Street are based on 15 grams of coffee grounds, a coffee-to-water ratio of 1:15, a water temperature of 88°C, a medium-coarse grind, and a 75% pass rate through a No. 20 standard sieve.

Brewing process

First, make preparations (warm the dripper and server, grind the coffee, prepare water at the appropriate temperature), then add the coffee grounds. Begin the first pour while starting the timer. Pour in 30 grams of hot water in the first stage, circling from the center outward. The coffee grounds absorb water and slowly expand, forming a plump "coffee hamburger."

Stop pouring when 30 grams of water has been added, and wait for a 30-second bloom. At the 31st second shown on the electronic scale, begin the second pour, circling from the center outward, keeping the flow steady and vertical. When the stream of water hits the coffee bed, foam will appear. This stage of brewing allows the coffee foam to be released, spreading across the entire surface of the coffee bed, with the liquid level rising to the base of the short ribs. The amount of water in this stage is 100 grams.

When the liquid level drops to the halfway point, begin the final pour. This stage also pours 95 grams in an "aroma-seeking" circular motion from the center outward. The originally dark brown foam turns into pale yellow coffee foam, and the liquid level also returns to the height reached in the second pour. After all the coffee liquid has flowed into the server, remove the dripper and end extraction.

How do you determine when to pour again?

Three-stage pouring has two re-pouring time points, namely the second and third stages. The timing for the second pour is very easy to grasp; usually, the second pour can be done 30 seconds after the bloom. The third pour is harder to grasp because there is no fixed time point; generally, wait until the water level drops by 1/2 or 2/3 before pouring again.

When the water level drops by 1/2 or 2/3, there will not be too much water accumulating in the dripper, nor will the coffee bed be exposed because the water level has dropped too much, which would cause uneven extraction of the upper and lower layers of coffee grounds.

After the water level drops, the stream of water can directly penetrate the accumulated water and agitate the lower layer of grounds. If the water level is too high, the impact force of the stream is insufficient, causing the upper layer of the coffee bed to be over-extracted while the lower layer of coffee grounds is under-extracted.

So what coffee beans are suitable for people who are just getting into pour-over coffee?

Front Street Ethiopia Washed Yirgacheffe G2 Country: Ethiopia Region: Yirgacheffe Altitude: 1800-2000 meters Variety: Local heirloom varieties Processing method: Washed Flavor: Jasmine, berries, lemon, citrus

Yirga cheffe is a small town in Ethiopia, at an altitude of 1700-2100 meters. It is one of the highest coffee-producing regions in the world and also synonymous with Ethiopian specialty coffee. Lake Turkana, Lake Abaya, and Lake Chamo bring abundant moisture here. In the rift valley represented by Misty Valley, fog lingers year-round, the seasons are like spring, the breeze is gentle, and it is cool and humid. Thousands of coffee trees thrive and multiply here, nurturing the unique terroir of Front Street Yirgacheffe, with its intertwined and ever-changing floral and fruity aromas. The so-called Yirgacheffe flavor refers to rich citrus-lemon acidity, a strong jasmine floral aroma, a light and elegant mouthfeel with a tea-like quality, drinking like a refreshing, clean lemon tea.

Front Street takes into account that washed processing better reflects the cleanliness of the coffee's mouthfeel and the purity of its flavor presentation. Therefore, when analyzing the specific flavor of a coffee-producing region, it uses the washed beans of that region as a reference. If every beginner has not tried Front Street Yirgacheffe, Front Street will also first recommend this Front Street Washed Yirgacheffe, as it helps form an understanding of the region's flavor. Afterward, when trying Yirgacheffe processed by natural, honey, and other methods, there will be a direction for comparison.

Front Street Coffee (FrontStreet Coffee) brewing recommendation Water temperature: 90-91°C Grind size: fine granulated sugar (fine granulated sugar size / 80% passing through a No. 20 sieve) Coffee-to-water ratio: 1:15 Dose: 15 grams

Front Street brewing method: In the first stage, pour 30 grams of water for a 30-second bloom, then pour 95 grams (the electronic scale shows about 125 grams), completing the pour in about 1 minute. When the water level drops to 2/3 of the coffee bed, pour the remaining 100 grams (the electronic scale shows about 225 grams), completing the pour in about 1 minute 40 seconds. Dripping is completed at 1'55''-2'00''. Remove the dripper and finish extraction.

[Front Street Ethiopia Washed Yirgacheffe] Brewing flavor: jasmine aroma, berry juice-like character, lemon and citrus acidity; overall bright, clean, and refreshing.

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