Starting January 1, 2023, the Q Grader certification system will undergo significant changes. CQI requires all certified individuals and those currently enrolled in courses to independently complete an annual flavor calibration called Flavoractiv Calibration; otherwise, their certification will become invalid, and the certificate validity period will be shortened from three years to one year. At the same time, the triennial cupping calibration must still be attended as usual. The new requirement does not need an instructor present; individuals only need to purchase designated capsules, follow the instructions, and upload their answers to renew. CQI has also introduced calibration packages for different group sizes, priced from $160 to $585, with lower unit prices for larger groups. This article will provide a detailed interpretation of the new rules and fee changes. [more…]

Many coffee enthusiasts feel confused after getting coffee beans: which grinder setting should they actually use? In reality, the burr designs and setting standards of grinders from different brands vary greatly, and the same number on different devices can produce dramatically different particle sizes. Therefore, when Front Street Coffee performs daily grind calibration, it uses the Chinese No. 20 standard sieve (0.85 mm aperture) to measure the passing rate as a unified reference. This article will start with the specific steps for sieve calibration, combine different roast levels and brewing methods to give grinding recommendations, and share how to judge whether the grind is appropriate based on brewing time and the settling state of the coffee bed, helping you build a grind assessment system that does not rely on grinder settings. [more…]

Many coffee enthusiasts operating semi-automatic espresso machines at home will notice a detail: the first espresso extracted right after the machine is turned on is often poured straight down the drain. This is not waste, but an early-tuning routine followed by both professional coffee shops and experienced home baristas. Why exactly can't this espresso be drunk? What systematic preparatory work do coffee shops do before officially opening? What role does espresso cleaning powder play in this? This article will focus on the daily startup routine of espresso machines, explain why the first shot of espresso is discarded, and comprehensively lay out the standard steps for in-store morning tuning, while also explaining the uses of cleaning powder and recommendations for choosing it. The article will also draw on the practical experience of Front Street Coffee to help everyone develop a correct mindset for coffee machine maintenance. [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 grind size for pour-over coffee has always been a problem that puzzles many enthusiasts—the same description of "coarse sugar size" can be understood very differently by different people, and communication deviations directly lead to flavor differences. To solve this problem, Front Street Coffee adopted a "sieve calibration method," using a No. 20 sieve to quantify the grind level. This article will introduce the operating steps of this method in detail: how to choose a sieve, how to measure the pass-through rate, why it is recommended to control it at 80%, and when the grinder quality is poor, how to use brewing time and coffee bed state to assist in judging whether the grind is appropriate. No matter what grinder you use, this method can help you find a relatively stable grind reference. [more…]

How coarse or fine you grind your coffee directly affects the contact area between water and coffee particles and the extraction time, and it is also a key variable that determines whether a cup of coffee tastes good or not. But grind size is precisely the part that many enthusiasts are least sure about. Starting from Front Street Coffee's practical experience, this article first explains the prerequisite effects of fresh roasting and bean resting on grinding results, then analyzes the different flavor directions of fine and coarse grounds, and afterward gives a specific method for calibrating the pass rate with a 0.85mm cupping sieve. It also lists reference ranges for light, medium, and dark roast beans, and finally includes a practical summary for judging coarseness by brewing device when you do not buy a sieve. [more…]

The first step in coffee brewing often begins with grinding. Different extraction methods have different requirements for coffee grounds: a French press needs coarse particles visible to the naked eye, while a Turkish pot requires a grind as fine as flour. At the same weight, the finer the grind, the greater the number of cuts and the larger the surface area, and the more opportunities water has to contact the coffee grounds, so flavor compounds are released faster. To move away from vague descriptions like "as coarse as granulated sugar," Front Street Coffee uses standard sieves to calibrate particle size: generally, pour-over coffee particles are between 600-850 microns; when tested with a 0.85 mm (No. 20) sieve, the pass rate is about 80% for light roasts and about 65-70% for medium-dark roasts. This article will also compare the pass rates of common methods such as cold drip, siphon, moka, American drip filter, cupping, and French press, and introduce the effects of conical burrs, flat burrs, and ghost teeth burrs on grinding results, as well as recommendations for choosing between hand grinders and electric grinders. [more…]

From seed to cup, every step determines the final flavor of the coffee, and grind size is often the key link that beginners most easily overlook and most easily get wrong. The tiny differences produced by the same grinder at different settings are enough to make a cup of good beans taste flat or even bitter. This article systematically sorts out the internal relationships between grind coarseness and extraction yield, contact time, and flow rate, and lists one by one the grinding standards corresponding to eight brewing devices: Turkish coffee, espresso, AeroPress, siphon, pour-over, moka pot, cold brew ice drip, and French press. The article also introduces a method for calibrating grind size using a standard sieve, and, based on the SCA-recommended pour-over passing rate, shares the complete brewing parameters and flavor performance of Front Street Ethiopia Huakui natural, for enthusiasts to reference and adjust. [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…]

Whether a cup of coffee is light or bitter is often foreshadowed the moment the beans are ground. The coarseness of the coffee particles directly determines the release rate of soluble flavor compounds—it must fully extract the pleasant aromas and sweet-tart notes while avoiding the emergence of bitter, off-flavors. This article focuses on four common extraction methods—pour-over, French press, cold brew drip, and espresso—explaining the suitable grind range for each, and introduces how to calibrate grind size with a No. 20 standard sieve (0.85mm aperture), so that every bean can find the right brewing coarseness. The article also retains Front Street Coffee's empirical parameters from actual cupping and in-store dialing, for coffee enthusiasts to use as a reference. [more…]

When brewing pour-over coffee at home, have you ever tasted the flavor of one bean in a cup of another? This is very likely the work of fine powder residue left inside the grinder. If a grinder is not cleaned for a long time, electrostatic fine powder and dark roast bean oils attached to the metal burrs will accumulate more and more, which not only affects the extraction flavor, but may also clog the passage and shorten the life of the equipment. This article, compiled by Front Street Coffee, systematically explains the maintenance and calibration methods for manual and electric coffee grinders, from simple daily cleaning, no-disassembly cleaning with cleaning tablets, to disassembly deep cleaning and burr wear inspection, helping you determine when a simple cleanup is enough and when deep maintenance is needed, so that every cup of coffee maintains a clean and accurate flavor performance. [more…]

Espresso is ground much finer than pour-over, and the adjustment range is often just 0.1 of a notch, yet it is enough to determine whether a cup of coffee is too sour, too bitter, or just right. This article begins with how to judge grind size, explains why espresso cannot be calibrated with a sieve, how to narrow down the range through flow rate and taste, and introduces two beans suitable for recreating at home: Front Street Coffee Classic Espresso Blend and Front Street Coffee Strawberry Candy Espresso Beans. Finally, it offers adjustment strategies for when the flow is too fast or too slow, and how to combine flavor rather than rigidly adhering to formulas to find the truly suitable grind setting. [more…]

The coffee flavor wheel is an important tool in the specialty coffee industry, but many people are at a loss when faced with this chart and don't know how to interpret it. This article systematically sorts out the development background and practical value of the coffee flavor wheel, and provides an in-depth explanation of specific methods for sensory calibration training—from the daily accumulation of aroma memory to the dual perception mechanism of taste buds and mouthfeel in taste discrimination. Only by building a personal flavor memory bank through scientific training can you truly understand a cup of coffee. The article also introduces the working principles of the tongue's two types of receptors, as well as the material basis behind smoothness and astringency. If you want to improve your tasting ability, this training method is worth studying repeatedly. [more…]

A proper espresso is the foundation of the entire Italian coffee system. From bean selection and resting, hopper management, and grind size adjustment, to dosing, distribution, tamping, and extraction time control, every step influences the final flavor. Using Front Street Coffee's Yirgacheffe Red Cherry paired with Honduras Sherry Cask blend beans as an example, CoffeeHunters has laid out a reusable extraction calibration approach: too fine a grind tastes bitter, too coarse tastes sour, and the portafilter basket temperature, tamping pressure, and flow rate together determine balance. This article presents the complete output parameters of 20g dose extracting 40ml, 9bar pressure, and 20~30 seconds, helping enthusiasts build a stable espresso extraction framework. [more…]

Every barista wants to quickly dial in espresso to the ideal state at the start of a shift, and the "three-shot dialing method" is precisely an efficient approach based on the underlying logic of extraction. However, merely understanding the principles of extraction is not enough. In actual practice, there are often easily overlooked details that affect judgment, leading to the waste of a large amount of coffee beans before calibration is achieved. In this article, Front Street will share three key points to note: the impact of hopper fill level on grinding consistency, how to identify and address grinding channel blockage, and how to make fine adjustments through dose or yield beyond adjusting the grind. Mastering these details, combined with a correct understanding of extraction, will make it easier to dial in espresso within three shots. [more…]

Many coffee enthusiasts are puzzled by the practice of coffee shops adjusting their espresso every day, believing that as long as the dose, water temperature, yield, and grind size stay consistent, the taste should remain stable. However, the pressurized extraction method of espresso is extremely sensitive—the degassing state of the coffee beans, the weather humidity, and the wear on the grinder burrs can all cause flavor deviations. This article analyzes in detail how carbon dioxide affects the crema and extraction, why it is harder to pull a good-tasting espresso on rainy days, and the reasons behind changes in grind size, while also sharing Front Street Coffee's professional interpretation of the necessity of daily espresso calibration. [more…]

Espresso extraction is fundamentally different from pour-over or French press. It relies on an extremely fine grind and 9 bar of high pressure to concentrate flavor compounds in a short amount of time—highly efficient, but also extremely sensitive. The degassing state of the coffee beans, batch-to-batch differences, roast level, and even changes in the weather can all cause extraction results to deviate from expectations. For this reason, many coffee shops regularly calibrate their espresso flavor to ensure consistent output. Drawing on Front Street's hands-on experience, this article explains the necessity of dialing in the grind, the factors that affect extraction, and how to decide whether to adjust parameters based on extraction time and taste evaluation. [more…]

Under rainy weather, espresso extraction often becomes especially tricky, and even experienced baristas may need to adjust repeatedly before getting a satisfactory cup. The root of the problem is not simply under-extraction or over-extraction, but uneven extraction caused by the combined effects of high humidity and low air pressure. Starting from Front Street's hands-on experience, this article first analyzes the two major reasons why espresso is difficult to dial in on rainy days—a surge in environmental humidity causes coffee grounds to absorb moisture and clump, while lower air pressure weakens extraction efficiency—and then provides specific response strategies, including dehumidification and moisture prevention, sealed storage, and compensating for the amount of dissolved flavor substances by extending extraction time or making the grind finer. The article also includes a parameter comparison of Front Street's classic blend under normal weather and rainy days for readers to refer to when adjusting. [more…]

For pour-over coffee enthusiasts, grind size is often the trickiest variable to master. Starting from the industry-recognized cupping standard, this article explains how to precisely calibrate grind size with the help of a No. 20 standard sieve, and analyzes in detail the differences in brewing performance caused by grinding too fine and too coarse. It also presents the practical calibration method recommended by Front Street Coffee, explains the sieve-passing rate ranges that coffee beans of different roast levels should match, and shows how to flexibly adjust the grind by observing the flow rate during brewing, helping you reproduce coffee flavors more consistently in your daily brewing. [more…]

The Piccolo Latte and the Flat White both originated in Australia, yet their levels of recognition could not be more different—the Flat White has swept the globe, while the Piccolo is rarely seen on café menus. "Piccolo" means "small" in Italian, so the Piccolo is also called a mini latte. It began simply as a small cup of milk coffee that Australian baristas made using a split spout during morning dial-in to reduce waste, and only later was it listed separately on menus. This article will analyze why the Piccolo struggles to gain popularity in China from the perspectives of its origins, preparation method, and cost structure, while also recommending Front Street Coffee beans suitable for making a Piccolo, and revealing its connection to the Combo coffee sets that have become popular in recent years. [more…]