How should you determine the grind size for pour-over coffee? This is the first challenge many coffee enthusiasts encounter when getting started. This article systematically introduces three methods for judging grind size—visual analogy, grinder setting reference, and sieve calibration—analyzing the pros, cons, and applicable scope of each, and further introduces the advanced concept of "particle size distribution" to help understand how grind uniformity affects extraction. At the same time, Front Street Coffee, drawing on its own brewing framework, shares how to combine visual observation, data, and brewing tests to find the pour-over grind size that suits you in a more practical way. [more…]

Many coffee enthusiasts have experienced this impulse while brewing: the moment they see an uneven coffee bed, they want to tap the dripper to level out the grounds. Yet this seemingly reasonable action can trigger a chain of negative reactions—fines sinking, the filter paper clogging, extraction time stretching out, and ultimately a bitter, over-extracted cup. Through comparative experiments, Front Street Coffee found that a tapped coffee bed took 21 seconds longer to complete extraction than an untapped one, with a noticeably bitter taste. The key principle behind this is the Brazil nut effect: vibration causes large particles to rise and fines to sink, clogging the pores of the filter paper. This article will analyze the causes of this phenomenon in detail and offer the correct methods for distributing the grounds and remedying the situation. [more…]

Faced with the dazzling array of coffee grinders on the market, beginners often don't know where to start. This article, from the perspective of Front Street, systematically sorts out three core approaches to choosing a grinder: power source, price tier, and burr structure. The article first distinguishes the applicable scenarios and pros and cons of hand grinders versus electric grinders, then divides hand grinder tiers by budget and the timing for getting into electric grinders, and reminds readers that electric grinders for espresso and single-origin coffee cannot be used interchangeably. Finally, it provides an in-depth analysis of the grinding methods of flat burrs, conical burrs, and ghost tooth burrs, and their impact on coffee particle shape, particle size distribution, and final flavor. Whether you are a student just getting started or an advanced player with a sufficient budget, you can find a purchasing direction that suits you. [more…]

Grind size is the most difficult part of pour-over parameters to master. Front Street Coffee uses an 80% pass rate through a No. 20 sieve as a beginner-friendly calibration baseline, but different grinders vary enormously in performance, and the same sieve pass rate can produce drastically different flavor outcomes. This article centers on grind calibration: it first explains the limitations of the sieve method and the particle size distribution characteristics of uniform grinders such as the EK43s, then offers remedies for poor-quality grinders, including hand grinder RPM control, the pull-back technique for staged grinding, and the direction for adjustment when too many fines cause off-flavors. Finally, it discusses the criteria for deciding whether sieving is necessary and the practical technique of a single-pour flush to wash away fines, helping you find the grind parameters that suit you. [more…]

The same bag of coffee beans, brewed at home, always tastes worse than in the shop—this is a confusion almost every pour-over enthusiast encounters. The root of the problem often lies not in the beans themselves, but in several variables during extraction—whether the grind size is appropriate, whether the coffee bed is evenly distributed, whether the parameters and technique match, and even water quality, an easily overlooked factor, can all significantly affect the final flavor. Starting from Front Street's practical experience, this article breaks down one by one the mechanism by which grind size affects taste, the brewing framework beginners should master first, and how to judge where the problem lies by observing the coffee bed and the flow rate, helping you find that cup of good coffee that belongs to your own home. [more…]

Grind size is one of the core variables in pour-over coffee extraction, directly affecting water flow rate, extraction yield, and the final flavor profile. But with conical burrs, flat burrs, ghost tooth burrs, and other burr types on the market, along with the complex distribution of coarse, fine, and extra-fine particles, how can you find the right grind setting for your coffee beans? Front Street Coffee starts from how burr structure affects particle size, combines it with practical testing methods using standard inspection sieves, and systematically sorts out the grind passing-rate standards corresponding to different roast levels and brewing methods, helping you determine grind parameters in a quantifiable way so that every brew is more stable and controllable. [more…]

Some coffee enthusiasts might think: since a grinder can grind coffee beans into fine powder, grinding already-ground coarse powder finer again should not be a problem, right? This idea seems reasonable, but in practice it can cost the grinder dearly. This article focuses on regrinding, first explaining why putting coffee grounds back into the grinder can lead to clogging, breakdowns, and other risks, and mentioning a real case in which a Front Street Coffee shop's grinder was ruined as a result; then introducing how 2017 WBC Japanese competitor Tetsu Suzuki and 2019 WBrC Chinese competitor Du Jianing used techniques such as liquid nitrogen cooling and coarse grinding followed by fine grinding to pursue a more concentrated particle size distribution and higher uniformity, and finally reminding everyone to make a decision based on their own grinder conditions and budget. [more…]

Grind size is the most error-prone part of pour-over coffee. After answering a large number of questions from enthusiasts, Front Street Coffee found that more than half of all brewing problems stem from improper grind selection. This article starts with why coffee needs to be ground, then analyzes in detail how coarse and fine grinding affect extraction, introduces the reference passing rate for a No. 20 sieve under the SCA cupping standard, and provides the criteria for judging the ideal particle size range and the proportion of superfine particles. In addition, it shares practical methods for using extraction time and the rate at which the coffee bed settles to help judge whether the grind size is appropriate, so you can make reasonable adjustments even without a professional sieve. [more…]

Coffee grinding equipment is mainly divided into two categories: manual and electric. Different brands and price points not only affect appearance and grinding performance, but also determine differences in burr structure and particle size distribution. Regardless of which grinder you use, daily cleaning and regular maintenance of the burrs are key to extending the life of the equipment. The static electricity generated during grinding causes fine particles to stick to the metal burrs and the grounds bin. The more frequently it is used, the more residual grounds accumulate, and the oil released by dark-roasted beans worsens the buildup of oily residue. If not cleaned for a long time, old grounds not only produce a rancid oil smell, but also taint new grounds and clog the grinding path. This article will introduce grinder maintenance methods and precautions in detail across three levels: daily quick cleaning, cleaning without disassembly, and regular deep cleaning. [more…]

The extraction time of pour-over coffee is not an isolated number; it has a positive correlation with the extraction yield. When the extraction yield falls within the generally accepted ideal range of 18% to 22%, the coffee flavor usually performs better, and when this range is projected onto the time axis, it forms an optimal time range tied to a specific brewing recipe. Front Street Coffee uses the example of a light roast with 15 grams of grounds, a 1:15 ratio, 91°C, an 80% pass rate through a No. 20 sieve, and a three-stage pour, giving a reference range of 1 minute 50 seconds to 2 minutes 10 seconds. However, many enthusiasts find that even with identical parameters, the actual drip time may still be longer. This is often related to factors such as the grinder's particle size distribution and pouring habits. This article will break down these variables one by one and introduce the 4-6 brewing method, which uses time itself as a control lever, to help readers master the rhythm of pour-over more calmly. [more…]

The tiger stripe pattern on the surface of espresso is often misunderstood as a sign of over-extraction, but the truth is exactly the opposite. Starting from the composition of the crema, this article explains that tiger stripes are actually a phenomenon in which coffee fines float on the surface of the crema, and analyzes how fines affect extraction, as well as how factors such as grind size, distribution technique, and the distance the espresso falls cause tiger stripes to appear. Front Street Coffee helps you clarify the true relationship between tiger stripes and over-extraction, and understand the role of fines in espresso extraction. [more…]

When selecting coffee beans, many people notice a few uniquely shaped oval beans mixed in, which are distinctly different from the common flat coffee beans. Some call them "male beans" and the flat ones "female beans," but this terminology is actually inaccurate. Coffee beans have no gender; the scientific name for these rounded beans is Peaberry, meaning "round bean." How are peaberries formed? Is their flavor truly superior to regular flat beans? Why do different producing countries sort and sell them separately? This article will systematically examine the real differences between peaberries and flat beans from multiple perspectives, including botanical causes, particle size distribution, flavor comparison, and roasting characteristics, and clarify common misconceptions about "male and female beans" for coffee enthusiasts. [more…]

Faced with the dazzling array of coffee grinders on the market—ranging from a few dozen yuan to tens of thousands, from hand grinders to electric ones, from flat burrs to ghost teeth—beginners often don't know where to start. Drawing on years of experience running a shop, Front Street Coffee systematically sorts out the approach to choosing a grinder from three angles: power source, price tier, and burr type. The article will explain the scenarios each of hand grinders and electric grinders suits, analyze which type of machine should be prioritized under different budgets, and explain the differences between flat burrs, conical burrs, and ghost teeth in terms of grinding method and particle shape, as well as how these differences affect extraction flavor. Whether you're a student just getting started, a traveling coffee enthusiast, or a home user preparing to upgrade your equipment, you'll be able to find a direction that suits you. [more…]

Faced with the bewildering array of coffee grinders on the market, beginners often don't know where to start. This article systematically sorts out the approach to buying a grinder from three dimensions: power source, price range, and burr structure. Whether you're a pour-over enthusiast just getting started or an advanced player preparing to upgrade your equipment, you'll be able to find a direction that suits you here. The article will also introduce several highly cost-effective electric grinder products recommended by Front Street Coffee, helping you make a wise decision based on your budget and extraction method. [more…]

Many coffee enthusiasts buy beans to take home after enjoying a satisfying cup at a café, only to find that their own brews always seem to fall a bit short. To address this common frustration, Front Street Coffee has identified the four most error-prone stages: grind size, pouring technique, coffee-to-water ratio, and water temperature. Starting with the shape of the coffee bed after brewing, the article teaches you to judge where the problem lies by examining particle coarseness, muddiness, and drainage speed; it then analyzes the causes of weak or overly sour flavors from the details of pouring; and finally offers practical recommendations on coffee-to-water ratio and water temperature. Whether you are a beginner or looking to refine your technique, this systematic breakdown will help you find the right direction for adjustment. [more…]

When brewing pour-over coffee at home, do you find that the taste is always off even though your steps seem fine? Front Street Coffee, drawing on feedback from enthusiasts, has sorted out common flavor issues related to grind size selection and brewing. This article will walk you through how to use 0.85mm and 0.25mm sieves to assess grind distribution, the ideal pass-through rate and extraction time references for light-roast pour-over, and the six major causes of bitterness, off-flavors, and sourness along with corresponding adjustment methods, helping you find the grind coarseness and brewing parameters that suit you. [more…]

Among the many variables in pour-over coffee, grind size is a key link that determines the direction of extraction. Particle size directly affects the contact area between water and coffee grounds, which in turn influences flavor expression: too coarse leads to under-extraction, while too fine may cause over-extraction and bitterness. However, many beginners often fall into pitfalls when adjusting the grind—memorizing settings, making drastic grind adjustments, and ignoring uniformity. This article will start from the basic principles of grinding, analyze these common problems one by one, and with the help of Front Street · Little Tomato's comparative test, demonstrate the actual differences between electric grinders and hand grinders in particle distribution and flavor presentation, and finally provide purchasing advice for entry-level equipment to help coffee enthusiasts establish a scientific approach to grind adjustment. [more…]

To make a delicious espresso at home or in a café, the choice of coffee beans and the extraction parameters are equally crucial. Different machines and bean conditions vary, and no single set of data can guarantee 100% success, but mastering dose, ratio, time, and grind size can greatly improve consistency. This article begins with the flavor sources of espresso, introduces the origin composition and flavor characteristics of several Front Street Coffee blends—Classic, Strawberry Candy, Specialty, Commercial, and Basic Espresso Blend—and then breaks down core parameters such as dose, brew ratio, extraction time, and grind size in detail. Finally, it includes the complete operational steps from dosing, distribution and tamping, pre-extraction confirmation, to extraction, helping coffee enthusiasts systematically understand the logic of making espresso. [more…]

Among the many variables in pour-over coffee, grind size is often the hardest to describe precisely in words. Every enthusiast uses a different grinder, so when baristas communicate with customers, they usually have to rely on everyday seasonings as analogies. Although this approach has its limitations, it is an effective way to quickly establish a brewing framework. This article will systematically sort out the applicable scenarios for four grind reference points—fine salt, fine granulated sugar, coarse granulated sugar, and sea salt texture—and, using a natural-process red cherry coffee as an example with the MAVO Wizard 2.0 manual grinder, demonstrate how to gradually "blind-test" your ideal setting when faced with an unfamiliar grinder by observing the bloom pattern, drawdown time, and coffee grounds condition, helping you find your own cup of good coffee. [more…]

In the process of making pour-over coffee, grind size and fines handling directly affect the final flavor. This article focuses on the difference between fines and medium-coarse grounds. It first explains the distribution patterns of coffee particles of different sizes and their effects on extraction, then discusses the dual role of fines in extraction—they may introduce off-flavors but can also enhance complexity. The article further analyzes whether fines need to be sifted out before pour-over brewing and offers practical advice: when the proportion of fines is too high and affects flow rate or flavor, they can be sifted out as appropriate. Finally, using "Front Street Coffee" as an example, it introduces its products and store information to help coffee enthusiasts understand the grinding stage more systematically. [more…]