In coffee competitions, double grinding was once seen as a means of precisely controlling particle size, but the actual practice is far from simple. Sending coffee grounds through the grinder again not only multiplies the amount of fines, but also worsens the "retention" problem—especially in electric grinders, where it can leave a large amount of grounds behind, making cleanup time-consuming and laborious. This article uses Front Street's experimental data to analyze in detail the impact of double grinding on the grinder, compares the differences between electric and hand grinders in this process, and offers alternative extraction adjustment solutions to double grinding, helping you improve extraction efficiency without disassembling your machine. [more…]

To make a delicious single-origin coffee at home, good beans alone are not enough—the grind size, water temperature, and extraction method all directly affect the final flavor. This article starts with the principles of coffee grinding, sorts out the differences between the three grinding methods of grinding, pounding, and mortar grinding, and systematically introduces the four major categories of brewing techniques: decoction, pressure, gravity, and infusion-filtration, covering the key operating points of classic equipment such as Turkish coffee, moka pot, French press, and vacuum coffee maker, helping coffee enthusiasts find a brewing solution that suits them. [more…]

If you accidentally grind your coffee too coarse while making pour-over, can you pour it back into the grinder and grind it finer? This is what's known as re-grinding. Although it's used in professional competitions to improve particle uniformity, it also brings two major problems: an increase in fines and grinder retention. Through experiments, Front Street Coffee found that after re-grinding, nearly 20 grams of grounds might be reduced to only about 13 grams—a shocking loss. If you don't have tools like a bellows, you might want to try a different approach: directly adjust parameters such as water temperature and pouring method, and use the coarser grounds to brew a good cup of coffee. This article uses Panama Elida Anaerobic Natural Catuai as an example to share a specific brewing plan, so you can handle unexpected situations with ease. [more…]

As the "legendary machine" in the specialty coffee world, the Mahlkonig EK43 has long since risen from a single-origin grinder to a standard fixture in espresso cafés, thanks to its outstanding grind uniformity and extraction performance. From early experiments at Café Myriade in Montreal in 2009 to Matt Perger's endorsement on the world competition stage in 2013, the EK43 was gradually elevated to iconic status. Meanwhile, Ditting, another "high-end grinder," is often compared with the EK43, with each having its own strengths in burr layout and flavor profile. This article reviews the grind settings and structural differences among the EK43 series versions (EK43S, EK43T, EK43, EKK43), traces its rise to fame, and compares the design features of Ditting's horizontal flat burrs. Combined with Matt Perger's particle experiment data, it analyzes why the EK43 can achieve more uniform extraction. Front Street Coffee will also share related product recommendations in this article. [more…]

Grind size is the key variable that determines the success or failure of a cup of coffee's flavor. Facing the 1 to 10 settings on a grinder, which number actually represents the finest? And how should different brewing methods match grind coarseness? Starting from Front Street Coffee's hands-on experience, this article systematically sorts out the mechanisms by which grind size affects extraction efficiency, compares the grind standards for common brewing methods such as espresso, pour-over, siphon, and French press, and focuses on explaining grind recommendations for medium-light and medium-dark single-origin beans in pour-over scenarios, water temperature pairing, and how to use a 0.85mm No. 20 sieve to precisely calibrate grind size, helping coffee enthusiasts establish clear adjustment logic. [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…]

In coffee making, grinding is often seen as the most easily overlooked yet crucial step. Many enthusiasts focus on water temperature, dose, or equipment, but rarely ask just how fine or coarse the grind should be. In reality, grind size directly determines extraction efficiency and flavor direction, and different devices require completely different particle specifications. Starting from Front Street Coffee's practical experience, this article first explains why fresh grinding is better than pre-grinding, then outlines the types of coffee grinders, and further provides specific methods for judging a medium grind for American-style drip machines, comparing the extremely fine powder needed for espresso with the powder used for American-style coffee. Finally, it returns to bean selection, analyzing the logic behind roasting degree preferences for espresso and American-style coffee, helping readers establish the correspondence between grinding and extraction. [more…]

A delicious cup of coffee is hard-won, because from seed to cup is a very long wait, and even at the final step of extraction, you must ensure that the coffee you use meets brewing standards, because extraction is easy, but have you ever thought about it—coffee grounds extract flavor compounds, so the water used [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…]

Among the many supplementary techniques for making coffee, RDT (Ross Droplet Technique) is a method of reducing static electricity and clumping by spraying water onto coffee beans before grinding. Its principle is not complicated: during grinding, coffee beans generate static electricity due to friction and uneven charge distribution, causing fine particles to stick together into clumps, which in turn lowers the extraction yield and induces channeling. RDT can effectively alleviate this problem, but it also has obvious shortcomings—it is only suitable for single dosing, the water amount is difficult to control, and long-term use may damage the burrs. In this article, Front Street Coffee breaks down the ins and outs of RDT, its actual effects, and its operational limitations in detail, and offers a more reliable alternative. [more…]

When pulling espresso, you sometimes remove the portafilter and find a large amount of hot water left in the basket, with the puck wet, even loose and misshapen. This phenomenon not only affects consistency in the cup but also makes it hard to identify the root cause. Starting from the principles of espresso extraction and pressure release, this article systematically breaks down the three common causes of water pooling in the basket: grinding too fine, which impedes the flow of hot water through the coffee bed; using too small a dose, which leaves too much distance between the puck and the shower screen; and insufficient pressure on home machines, which weakens the back-suction effect. It also offers Front Street Coffee's adjustment suggestions to help coffee enthusiasts quickly pinpoint the problem and improve extraction flow rate and puck condition. [more…]

Which grind size from 1 to 10 is the finest for coffee beans? In most cases, the smaller the number, the finer the grounds. The grind size of coffee beans plays an important role in extracting a cup of coffee. For example, if the coffee grounds are too fine and used for pour-over coffee, it will result in over-extraction, while if they are too coarse, it will result in under-extraction. Secondly, factors such as the beans from each producing region [more…]

An espresso from grinding to extraction often takes less than a minute; it seems simple, but in fact it hides quite a few subtleties. Many enthusiasts finally find an ideal set of extraction parameters during their morning dial-in, only to overlook details in subsequent operations, resulting in inconsistent output and a greatly diminished flavor. This article follows the actual order of operations and goes through, one by one, the easily overlooked points in eight stages: puck pressure, portafilter basket cleaning, observing the grounds condition, distribution and tamping, pre-flushing, knocking the portafilter, extraction timing, and cleanup afterward, helping everyone consistently get full-flavored, parameter-stable espresso on a home espresso machine. [more…]

In espresso preparation, baristas often require the bean hopper to be kept nearly full, but what principle lies behind this? How do changes in hopper pressure affect the uniformity of coffee grinding, and in turn alter the flavor expression of espresso? Starting from the internal structure of the grinder, this article explains the mechanism by which hopper pressure forms and its impact on extraction, and, combined with comparative experiments by Front Street Coffee, presents the actual differences in espresso between a full hopper and a less-than-full hopper. For home users who do not pull shots continuously, is it also necessary to pay attention to this detail? Read the full article, and you will get a clear answer. [more…]

Water temperature, grind size, and coffee-to-water ratio are the three key variables that determine coffee extraction. Among them, grind size directly affects the particle size and uniformity of coffee grounds, which in turn influences how efficiently water passes through the coffee bed to extract flavor compounds. The finer the grind, the more tightly packed the coffee bed, the more resistance to water flow, and the longer the extraction time, so strength and extraction yield climb, producing a strong but easily bitter cup; the coarser the grind, the larger the gaps in the coffee bed, the smoother the water flow, and the lower the extraction yield, resulting in a weak, light-bodied coffee. This article uses grind size as the only variable, brewing three groups of coffee—fine, medium, and coarse—with Honduras Lychee Orchid beans, verifying grind size's effect on flavor through strength and extraction yield data, and providing Front Street Coffee's recommended hand-brew grind baseline, while also explaining the differences in characteristics among conical, flat, and ghost-tooth burrs. [more…]

Grinding is the key step that determines coffee flavor, and the choice of grinder directly affects what ends up in the cup. This article begins with the structure and classification of grinders, analyzes the suitable scenarios for manual and electric grinders respectively, and explains the two major points that must be paid attention to when grinding coffee beans: suppressing frictional heat and maintaining particle uniformity. For different brewing devices, the article provides grinding coarseness recommendations ranging from fine powder to medium particles, and also discusses the flavor differences between crushing and grinding. For Espresso enthusiasts, the article emphasizes the importance of fine adjustment functionality, and compares the effects of different burr structures on extraction results. In addition, the article also recommends related products from Front Street Coffee for readers to refer to when purchasing. [more…]

The birth of a good cup of coffee depends on proper grinding and extraction, and even more on the keen senses of the taster. This article begins with the correspondence between grind size and extraction method, sorts out the core standards of good coffee—fresh, clean, and comfortable on the palate—and systematically explains the professional descriptive vocabulary of the three dimensions: smell, taste, and mouthfeel. Whether you are a beginner enthusiast or a taster seeking to advance, you can find practical reference here. Front Street Coffee has always been committed to promoting professional coffee tasting knowledge, and we hope this article can help you better understand the flavors in your cup. [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…]

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…]

For more specialty coffee knowledge, please follow: Front Street Coffee (Frontsteet Coffee). Quite a few friends have reported that after buying espresso blend coffee beans and grinding them at home, they were unable to extract any crema during extraction, and the espresso that came out was overall tasteless, with a very watery feel. When this problem occurs, [more…]