Which Elements of Coffee Matter Most in Pour-Over?

Seven elements drive pour-over results: bean freshness, grind size, water temperature, water quality, dripper choice, coffee-to-water ratio and brewing time. Together they shape coffee extraction, which moves through three stages, wetting, dissolution and diffusion. Freshness comes first, since beans hold their flavor for about 30 days after roasting before carbon dioxide and aroma fade.

Grind size controls flow: a finer grind packs the filter, slows the drip and can pull out woody or muddy notes, while a coarser grind speeds flow and leaves the cup weak. The elements of coffee work as a set, so changing one means adjusting others. A complete brew, shown with an Ethiopian Sidamo natural Hualuogui, ties the seven points together.

When first getting into pour-over coffee, many people feel at a loss facing the wide variety of equipment and techniques. In fact, by grasping just a few core points, you can quickly improve your brewing skills. This article draws on the practical experience of Front Street Coffee to outline the seven key elements of pour-over coffee, including bean freshness, grind size, water temperature, water quality, dripper choice, coffee-to-water ratio, and brewing time, and further explains the three stages of coffee extraction: wetting, dissolution, and diffusion. Finally, using Ethiopian Sidamo natural Hualuogui as an example, it demonstrates a complete brewing process and flavor performance, helping enthusiasts move from beginner to professional.

For friends just getting into pour-over coffee, facing various equipment and brewing techniques, they often feel at a loss, and may even find the process cumbersome. Many enthusiasts also come to Front Street to ask about pour-over basics. In this article, Front Street will systematically explain the seven key elements of pour-over coffee and the extraction principles behind them.

These seven elements are concise key points summarized by the baristas of FrontStreet Coffee based on long-term practical experience, with the aim of allowing learners to quickly grasp the core matters to pay attention to when brewing coffee without having to read through a large amount of material.

1. Use fresh coffee beans Front Street believes the best flavor period for coffee beans is 30 days. After this time, as carbon dioxide is released, aroma molecules gradually decrease, and the brewed coffee easily tastes flat and dull. Therefore, every time Front Street discusses brewing knowledge, it first emphasizes "you must use freshly roasted coffee beans."

2. Coffee bean grind size The finer the grind, the more easily coffee grounds accumulate at the bottom of the filter paper, increasing water flow resistance, slowing the flow rate, and prolonging extraction time, so the final cup easily carries unpleasant flavors such as woody or miscellaneous notes. The coarser the grind, the larger the gaps in the coffee bed, the less hot water contacts the coffee grounds, the lower the resistance, the faster the drip rate, and the lower the extraction yield, so the coffee flavor is also weaker.

In order for every bean to find the most suitable grind size, Front Street recommends preparing a No. 20 cup test correction sieve with an aperture of 0.85 mm. Take 10 grams of coffee beans, first adjust to an approximate grind size and grind into powder, then pour it into the sieve and sift until no more powder can pass through, then weigh the sifted powder. A pass rate of 80% (8 grams sifted from 10 grams of powder) corresponds to the most suitable grind size for medium-light roasted beans; a pass rate of 70%–75% (7–7.5 grams sifted from 10 grams of powder) is suitable for medium-dark roasted beans. If the pass rate is too high, adjust the grind coarser; if it is too low, adjust it finer.

3. Brewing water temperature FrontStreet Coffee uses different water temperatures when brewing beans of different roast levels. During roasting, substances inside the beans are lost as the roast deepens, so for dark roasted beans, the water temperature is lowered to avoid extracting too many off-flavors. For medium-light roasted beans, FrontStreet Coffee recommends water at 90–91°C, while for medium-dark roasted beans it recommends 87–89°C.

4. Water quality Mineral components in water, such as calcium, magnesium, sodium, and potassium ions, affect coffee's thermodynamic extraction ability and thereby change the flavor. FrontStreet Coffee does not recommend directly heating tap water for brewing, because it contains more impurities and easily extracts unpleasant flavors.

5. Choice of dripper Front Street recommends that beginners choose the V60 01 dripper. The V60 conical dripper has a wider opening, and together with its unique spiral curved ribs, it allows air to escape more smoothly, thereby improving extraction quality. Although the mouthfeel may not be thick enough, the acidity and sweetness brought by high concentration and its obvious aroma are its standout features.

6. Coffee-to-water ratio for pour-over coffee According to the SCA Golden Cup extraction theory, different coffee-to-water ratios bring different taste differences:

[Bold flavor] 1:10–1:11 (that is, 1:12.5–1:13.5 under the Golden Cup standard) [Moderate flavor] 1:12–1:13 (that is, 1:14.5–1:15.5 under the Golden Cup standard) [Light and fresh] 1:14–1:16 (that is, 1:16.5–1:18.5 under the Golden Cup standard)

When the ratio of coffee bean grams to brewing water is between 1:14.5 and 1:15.5, it is easiest to reach the golden range of 18%–22% extraction yield and 1.15%–1.35% concentration, which is also why FrontStreet Coffee has always recommended brewing at 1:15.

7. Brewing time for pour-over coffee During extraction, the aroma and flavor in the early stage are rich and the concentration is high; the later it goes, the lighter the flavor and aroma become, and the amount of water poured also affects extraction time. FrontStreet Coffee generally uses 15 grams of powder, depending on the beans, and with a coffee-to-water ratio of 1:15, controls the brewing time within 2 minutes to 2 minutes 30 seconds, making it less likely to over-extract or under-extract.

Having covered the seven elements, let's now talk about the brewing principles of pour-over coffee.

Brewing coffee is essentially the process of extracting molecules from coffee cells, which includes three steps: wetting, dissolution, and release. These three steps occur in sequence and influence each other, ultimately forming the flavor of the coffee.

[Wetting] Literally, this means the coffee grounds are moistened after contacting water. This is the starting point for coffee cells to begin releasing molecules, which is what Front Street often calls the blooming process.

[Dissolution] This refers to the process in which soluble molecules in coffee cells dissolve into hot water. This is the most critical step and determines the extracted coffee flavor, which is what Front Street often calls the extraction process.

A coffee bean is 70% insoluble cellulose, and the other 30% is soluble aroma molecules, which dissolve out in order of molecular size when meeting water. The first to dissolve out are small-molecule substances, including acidity and aroma, such as floral notes and citrus acidity; next are medium-molecule sweetness, such as fruity sweetness, honey, and brown sugar sweetness; last are large-molecule burnt bitterness. This is where coffee's layering comes from. Therefore, if you prefer a sweeter and more fragrant taste, the extraction time should be shorter, because the longer hot water stays on the coffee grounds, the more bitter molecules dissolve out.

[Diffusion] After aroma molecules dissolve, they leave the coffee cells through permeation, and this process is called diffusion. After aroma molecules diffuse into the hot water, the final coffee extract is formed. Front Street also mentioned earlier that the extraction order of a cup of coffee is first acidity, then sweetness, and finally bitterness, so after extraction is complete, be sure to swirl a few times to let the coffee liquid blend evenly, so you can taste the most complete flavor.

Having explained the brewing principles, next FrontStreet Coffee will use the pour-over method to brew the Front Street Sidamo natural Hualuogui 8.0 from Ethiopia, to see how the baristas operate.

Front Street Ethiopian Sidamo natural Hualuogui coffee beans Region: Guji Hambela Processing station: Buku Able Altitude: 2350 meters Variety: local heirloom variety Processing method: natural process

FrontStreet Coffee pour-over parameters: Hario V60, coffee-to-water ratio 1:15, grind size BG#6S (80% pass rate on China standard No. 20 sieve), water temperature 90°C.

In terms of brewing technique, FrontStreet Coffee uses twice the coffee powder weight in water for blooming, that is, 30 grams of water, and blooms for 30 seconds. Then pour in a small stream in circles until 125 grams, pause, and when the water level drops and is about to expose the coffee bed, continue pouring until 225 grams and stop. When the water level drops again and is about to expose the coffee bed, remove the dripper. The total extraction time (starting from the bloom) is 2 minutes 00 seconds.

[Front Street Ethiopian Sidamo natural Hualuogui] Brewed flavor: At high temperature it has almond aroma; after the temperature drops, citrus acidity appears, with a full berry juice sensation, accompanied by a lemon black tea tea-like body, and a lasting sweetness.

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