Many coffee enthusiasts, before brewing pour-over coffee, hear experienced baristas emphasize the step of "seasoning the grinder." But seasoning actually comes in two forms: one is the daily deep cleaning of the grinder, and the other is the "pre-grinding" done before each grind. The two serve different purposes and should not be confused. This article explains in detail why a small amount of beans from the same batch should be used to season the grinder before grinding coffee beans, how residual coffee powder and burr oils affect the flavor of the next cup, and why an air blower cannot replace bean seasoning. At the same time, Front Street Coffee will also offer recommendations on the amount of beans to use for seasoning, helping you present the true flavor of each bean in a purer way. [more…]

Starbucks has clearly picked up the pace of new product launches this year. Before people have even had a chance to check in on the cherry blossom limited edition, the Salted Flat White has already taken over as the store's main promotion. However, this new product has sparked controversy because of black powder residue left at the bottom of the cup, with many consumers suspecting that staff had made an operational error and mixed in coffee grounds. Faced with complaints, Starbucks staff collectively protested their innocence—having coffee powder is actually the correct method, and not having it would instead be a violation. What exactly is going on here? Why is the freshly ground coffee powder used for decoration so often mistaken for extraction residue? And why do consumers have so many complaints about the taste? This article will reconstruct the whole incident and analyze the gap between the standard recipe for this beverage and the consumer experience. [more…]

You dialed in your espresso extraction parameters in the morning, but by noon the flow has slowed and become unstable? Besides changes in humidity and switching beans, coffee residue built up inside the group head is often the culprit. Backflushing is the key method for removing this residue—using a blind basket to force water to flow backward through the lines, then combining it with cleaning powder to deep-clean stubborn coffee grime. This article explains in detail the procedures for water backflushing and cleaning-powder backflushing, the number of repetitions, and the daily maintenance frequency, helping baristas maintain stable extraction and avoid off-flavors getting into the cup. [more…]

Many coffee enthusiasts will notice that with the same beans and the same machine, the flow rate of espresso can change every few hours or even every few dozen minutes, sometimes fast and sometimes slow. Beyond the aging characteristics of the coffee beans themselves, there are actually quite a few easily overlooked hidden factors influencing the extraction results, including residual grounds in the grinder's chute, temperature fluctuations in the espresso machine's hot water, the state of the pump pressure, changes in ambient temperature, humidity and air pressure, and whether the grinder's hopper pressure remains stable in a café setting. Front Street will analyze these factors' mechanisms of influence on espresso extraction one by one, and provide corresponding improvement solutions to help everyone reduce unnecessary adjustments and make their output more consistent. [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…]

Many coffee enthusiasts have noticed that after switching on, coffee shops often pour away the first espresso pulled before they begin serving drinks as normal. Behind this seemingly wasteful gesture are actually multiple considerations, including cleaning powder residue, overnight coffee grounds, and machine parameters that have not yet stabilized. But for home users who only make one or two cups a day, is it necessary to copy this practice? Starting from the actual operating habits of Front Street stores, this article systematically sorts out the reasons why the first espresso is discarded, and offers specific advice for home scenarios on whether it needs to be poured out, how to properly handle residual grounds, and how to effectively preheat the coffee machine after deep cleaning, helping you ensure stable flavor in every cup while reducing waste. [more…]

I believe baristas must have encountered this problem: in the morning, the espresso extraction parameters are dialed in, but by noon, the parameters are no longer accurate, and the coffee flow rate has noticeably slowed down. Front Street has previously offered explanations for two scenarios regarding this issue. The first is when it rains and the humidity in the air is relatively high, inside the bean hopper. [more…]

When making cold brew coffee at home, an oily sheen often floats on the surface, and fine sediment may appear at the bottom of the cup, leaving many coffee enthusiasts puzzled. What exactly are these floating substances? Is the coffee spoiled, or is the equipment unclean? In fact, this is closely related to the slow release of water-soluble fats from coffee beans at low temperatures. This article, drawing on Front Street Coffee's practical experience, analyzes the causes of cold brew oils, explains how the differences in mesh sizes of various filtering devices affect coffee flavor, and shares how to use secondary filtration with paper filters and refrigeration settling to make cold brew's juicy feel fuller and its acidity clearer. At the same time, regular deep cleaning of equipment is equally crucial to avoid the accumulation of condensed oil residue that produces a rancid odor. [more…]

After pulling an espresso shot, the ideal puck should be dry, intact, and come out in one solid piece without crumbling. But in practice, many coffee lovers run into a soggy, muddy puck with standing water at the bottom of the basket. This abnormal phenomenon is usually linked to four factors: grinding too fine, coffee beans stored too long so they lose carbon dioxide, too large a gap between the puck and the dispersion screen, and unstable extraction pressure in the espresso machine. This article breaks down the principle behind each cause one by one and offers corresponding troubleshooting and adjustment methods to help you quickly pinpoint the problem and get back to normal extraction. [more…]

Many coffee enthusiasts have added espresso machines to their homes, but due to a lack of knowledge about cleaning and maintenance, problems such as weakened steam, uneven water flow, and even portafilter leaks begin to appear after the machine has been used for a while. This article systematically organizes maintenance methods for home espresso machines: from the routine cleaning of the steam wand and shower screen after each brew, to using a blind basket to backflush and remove internal residue before shutting down, and then to regularly using specialized cleaning powder for deep treatment of the steam wand, shower screen, and portafilter basket. The article also explains in detail the steps for replacing the brew head gasket after it ages, and reminds readers that water needs to be filtered to prevent scale from damaging the boiler. The article involves practical experience with the machine models used in Front Street Coffee stores, and is suitable for coffee enthusiasts to follow and implement. [more…]

The espresso machine is the core equipment of a coffee shop. Regular cleaning not only extends the machine's lifespan but also ensures the consistency of every cup produced. This article focuses on the key step of cleaning the interior of the group head, explaining in detail the specific procedures for quick cleaning, daily backflushing, and long-term maintenance. From judging residue on the dispersion screen to the backflush process using a blind basket with cleaning powder, and then to soaking the portafilter to remove oils, each step has clear requirements for timing and frequency. At the end, it also reminds readers that professional deep maintenance is needed every 1–2 years, making this a worthwhile reference for both coffee enthusiasts and industry professionals. [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…]

For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Studio (WeChat official account: cafe_style). For more specialty coffee beans, please add our private WeChat: Front Street Coffee (FrontStreet Coffee), WeChat ID: qjcoffeex. With the rise of specialty coffee culture [more…]

With the growing popularity of home coffee equipment, more and more people are choosing to use a pour-over kettle paired with a small electric grinder to make freshly ground coffee at home. However, using an electric grinder is not simply a matter of plugging it in, turning it on, and dumping in beans—some improper operating habits not only affect the coffee's flavor but can also shorten the grinder's lifespan. Drawing on Front Street Coffee's practical experience, this article shares several key tips for using an electric burr grinder, including "rinsing the burrs" before grinding to avoid flavor transfer, starting the machine before adding beans to protect the burrs, and daily quick cleaning plus periodic deep cleaning as maintenance methods. Whether you are a complete beginner or someone who has been using an electric grinder for a while, these details can help you get the most out of your grinder and keep every cup of coffee tasting consistently good. [more…]

When grinding coffee beans, you will often find yellowish-white flakes mixed in with the grounds—these are the silver skin of the coffee bean. The silver skin is the last natural layer wrapping the green bean before roasting, and how much of it remains varies by processing method: naturally processed beans shed their silver skin relatively completely, while washed beans tend to leave an obvious white line at the center of the bean. Many coffee lovers wonder: do these silver skin flakes interfere with the flavor of the coffee? The roasters at Front Street Coffee designed a set of experiments specifically for this, extracting silver skin by three methods—pour-over, tea bags, and espresso machine—to verify its actual impact through taste performance. This article will walk you through the structural characteristics of silver skin, the differences in how much remains under different processing methods, and the flavor conclusions drawn from the experiments. [more…]

Last week, Front Street Coffee shared nine details about brewing coffee, among which it mentioned that the grinder needs to be cleaned regularly. So a reader followed up with the question: Can a grinder actually be washed with water? To answer this question, we first need to understand the necessity of cleaning the grinder. The common grinding equipment on the market falls into two categories: manual and electric. Regardless of which type, the daily upkeep and regular maintenance of the burrs directly affect the service life. Accumulated coffee grounds not only cause flavor cross-contamination, but may also clog the passage. This article will detail the cleaning methods for manual and electric coffee grinders across three levels: daily quick cleaning, cleaning without disassembly, and regular deep cleaning, and will also remind you of the applicable conditions and precautions for washing with water. [more…]

If you love brewing pour-over coffee at home, have you ever noticed that your brewed coffee tastes like it's mixed with other beans? This is very likely the work of fine powder residue left inside your grinder. Over time, static electricity causes fine powder to cling to the burrs, and the oils from dark-roasted beans build up as well. Before long, this not only affects flavor but can also clog the chute and shorten the machine's lifespan. So how exactly should you maintain your grinder? How often should you clean it? What's the difference between cleaning a hand grinder and an electric grinder? Can the burrs be washed with water? Front Street Coffee has put together a complete process, from simple daily cleaning to deep disassembly, to help you resolve all your grinder maintenance questions. [more…]

If a home espresso machine is neglected for a long time, extraction quality will gradually decline and may even lead to malfunctions. Using hands-on operation as an example, this article systematically explains how to clean the key parts of a coffee machine. It covers the simple rinsing and deep backflushing process for the dispersion screen, techniques for wiping the steam wand surface and soaking the tip, and key points for cleaning the portafilter spout area. Through regular maintenance, you can effectively extend the machine's lifespan and avoid costly repairs. The steps in the article are clear and suitable for coffee enthusiasts to follow on their own. [more…]

The Moka pot has become the preferred brewing device for many households thanks to its simple operation. Compared with the precise requirements of espresso, the Moka pot emphasizes practicality and convenience. This article will walk you through the complete process of making black coffee with a Moka pot, including key steps such as how much water to add to the lower chamber, techniques for filling the filter basket with grounds, and how to control the heat. It will also answer common questions, such as why clear water sometimes comes out first. In addition, when it comes to choosing coffee beans, we will draw on several Front Street Coffee bean options to explain why medium-dark roasts are better suited to the Moka pot, and how to select beans that match your own taste. Whether you are a beginner just getting to know the Moka pot or a more advanced user looking to improve your results, you will find practical advice in this guide. [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…]