When an unpleasant flavor appears in a cup of coffee, it is often not accidental, but rather a deviation in some detail during growing, processing, roasting, or brewing. If we can identify these negative flavors one by one, we can work backward to infer what went wrong with the cup, which is practically helpful for improving tasting ability and optimizing brewing and roasting. Front Street Coffee has compiled several of the most common off-flavors in pour-over coffee—including miscellaneous odors, earthiness, woodiness, smokiness, charcoal, medicinal notes, mustiness, rubber, and rot, as well as astringency and dryness, two tactile sensations that are not tastes—and analyzes their causes and key points for identification one by one. [more…]

Cleanliness is an important dimension in judging coffee quality. It reflects whether a cup of coffee carries negative flavors such as earthiness, hay, or woodiness, or unpleasant sensations like astringency and dryness. From harvesting and processing to roasting and brewing, every stage can influence the level of cleanliness. This article starts with the emphasis COE cupping places on cleanliness, traces the historical problems Brazil—the world's largest coffee-producing country—has faced due to machine harvesting and rough sun-drying, and then extends to the impact of the roasting and brewing stages on cleanliness, helping coffee lovers systematically understand the industry chain logic behind a clean cup of coffee, while also retaining relevant recommendations for the Front Street brand. [more…]

Many coffee enthusiasts, upon getting freshly roasted beans, can't wait to brew a cup, only to find the flavor flat, the body thin, and even a dry, uncomfortable throat afterward. The key behind this lies in the large amount of carbon dioxide remaining inside the coffee beans after roasting, as well as the smoky, pungent sensation brought by high-temperature roasting. This article will delve into why fresh coffee beans need to "rest" before brewing, how carbon dioxide interferes with the extraction process, and the true source of that dry throat sensation. At the same time, Front Street will also share a few practical methods to help you still brew a relatively ideal flavor even when the beans are too fresh. [more…]

When drinking coffee, you may occasionally encounter an unpleasant experience that isn't smooth enough and has a slightly sandy mouthfeel—this is what we commonly call astringency. Where exactly does astringency come from? It may originate from the cultivation and processing of green beans, and may also be closely related to roasting, the mixing in of defective beans, and brewing parameters and techniques. This article will start from the material basis of astringency, sort out the difference between positive and negative astringency, analyze the two major brewing causes of over-extraction and uneven extraction, and also clarify the differences between astringency, tea-like character, and a dry sensation, finally offering practical adjustment ideas. The article also retains relevant product and recommendation information from Front Street Coffee, making it convenient for coffee lovers to refer to in daily brewing. [more…]

The freshness of coffee beans directly determines the flavor performance of a cup of coffee, yet many coffee lovers often stumble when it comes to storage. This article will systematically explain the core principles of coffee bean preservation—the four key elements of sealing, coolness, dryness, and light protection—and analyze one by one how the corresponding "Four Heavenly Kings" accelerate the loss of coffee flavor. At the same time, we will also provide practical storage advice to help you maximize the shelf life of coffee beans in your daily routine. If you are looking for reliable fresh coffee beans, the daily beans series from Front Street Coffee is worth checking out. [more…]

For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat official account: cafe_style). For more specialty coffee beans, please add our personal WeChat Front Street Coffee (FrontStreet Coffee), WeChat ID: qjcoffeex. "Are coffee beans [more…]

Many coffee enthusiasts encounter an awkward situation when they first start brewing pour-over: the coffee they brew doesn't taste bad, but the flavor is always vague—they can't quite put their finger on what it actually tastes like. Many people attribute this to the beans themselves and give up on further adjustment. But in fact, unclear flavor often has nothing to do with the beans—it's certain variables in the brewing process that have gone wrong. Drawing on Front Street Coffee's practical experience, this article sorts out four core reasons that may lead to vague flavor—coffee concentration being too high, over-extraction, coffee beans being too fresh, and brewing water being too hard—and provides specific adjustment plans for each situation to help you rediscover the flavor layers of your pour-over coffee. [more…]

To make a velvety, smooth latte or cappuccino at home, steaming milk is an unavoidable fundamental skill. This article starts with the principles of milk foam, first explaining the roles of the two stages—"aeration" and "texturing"—then compares the pros and cons of tools such as electric handheld frothers, manual frothing pitchers, hot/cold electric milk frothers, and espresso machine steam wands, with a key breakdown of the complete steam frothing process. The content covers the effects of milk fat and temperature, the choice of steam wand hole count and dryness, the considerations for pitcher size and shape, as well as practical tips on insertion angle, judging by sound, controlling aeration volume, and testing integration. The article also incorporates recommendations from Front Street Coffee, offering practice suggestions suitable for beginners. [more…]

Extraction is the most central yet most easily misunderstood part of coffee brewing. Starting from flavor and mouthfeel, this article systematically sorts out the typical signals of under-extraction and over-extraction, helping you quickly judge the state of a cup of pour-over coffee and adjust parameters accordingly. Under-extraction often shows up as sharp acidity, a lack of sweetness, a salty sensation, and a short finish; over-extraction brings bitterness, dryness, and a hollow feel. Once you understand these clues, you can correct grind, time, and ratio with more direction, bringing the coffee back to a balanced, delicious place. The article also retains product recommendation information related to Front Street Coffee, making it convenient for everyday practice and comparison. [more…]

When brewing coffee, unpleasant flavors often come down to two situations: under-extraction or over-extraction. Front Street Coffee has found that many beginners can taste that something is off with their coffee but can't pinpoint the problem. This article starts with the definition of the Golden Cup standard, explaining the reference range of an 18%–22% extraction yield, while also pointing out that the Golden Cup is not an absolute standard and that coffee bean quality can affect the results. It then details the three main signs of under-extraction—watery flavor, thin body, and sharp sourness, astringency, and saltiness—as well as the characteristics of over-extraction, such as pronounced bitterness, dryness, and woody off-flavors. Finally, it offers a practical adjustment plan that uses grind size as the variable while keeping water temperature, time, and water amount fixed, helping everyone quickly find the parameters that suit them. [more…]

In pour-over or espresso preparation, baristas often perform actions such as tapping the table or shaking the milk pitcher, and these behaviors actually have clear professional purposes. From the perspective of Front Street, this article explains two common reasons: first, static electricity generated during grinding in dry seasons, which causes fine particles to stick together or cling to the walls, affecting extraction uniformity; second, large bubbles left by mistakes when steaming milk, which need to be eliminated by shaking the pitcher. Regarding the static electricity issue, the article introduces the RDT droplet technique proposed by David Ross, which suppresses static electricity at the source by spraying a very small amount of water before grinding, while also reminding readers about water volume control and alternative methods. Regarding milk foam bubbles, it explains the professional terminology and operational logic of tapping and shaking the milk pitcher, helping coffee enthusiasts understand and optimize their daily output. [more…]

SOE is short for Single Origin Espresso, referring to espresso made from coffee beans of a single origin or estate. Its difference from common blends lies not merely in the origin label, but in how it brings the character of a particular region, variety, or processing method into a short, highly concentrated extraction. [more…]

Freshly roasted coffee beans are filled with active carbon dioxide gas internally. During extraction, this gas creates resistance that prevents hot water from fully contacting the coffee grounds. For espresso extraction, excessive gas makes the crema appear coarse and dissipate quickly, while the flavor tends toward dryness. Allowing the roasted beans to [more…]

When selecting hand-brewed coffee beans by roast level, they can generally be divided into light, medium, and medium-dark roasts. Light roasts preserve more of the origin's character, often featuring floral notes, fruity acidity, and a crisp body; medium roasts strike a balance between sweetness, acidity, and body; medium-dark roasts shift the flavor toward nuts, cocoa, and caramel. First, understand this spectrum of change. [more…]

To accurately describe the taste and mouthfeel of a tea, just saying "it's good" is far from enough. The terms commonly used in tea tasting—huigan (returning sweetness), shengjin (salivation), houyun (throat rhyme), suohou (throat lock), astringency, and guabei (cup-clinging aroma)—each have clear meanings and criteria for judgment. This article breaks down these tasting concepts one by one, helping you describe the true sensations in your mouth and throat with more precise language when introducing Milan Xiang Dancong, while also avoiding poor-quality teas when actually selecting tea. [more…]

After coffee is roasted, aromatic compounds continue to escape outward. If the amount purchased exceeds what can be consumed within its peak-flavor window, the flavor will suffer greatly. This article begins with conventional storage ideas such as sealing, protection from light, coolness, and dryness, then focuses on analyzing the recently popular method of freezing coffee beans: it can indeed slow the loss of aroma, but improper handling can backfire. The article unfolds around three key details—sealing to prevent odor transfer, condensation and moisture damage, and avoiding repeated removal and return—and offers practical advice on portioning for storage. Front Street also reminds everyone that coffee is ultimately best enjoyed fresh, and buying only what you need is the worry-free approach. [more…]

Front Street Coffee takes you on a continued exploration of the mystery behind Tai Cha No. 18 Hong Yu. Shanxi Tea Industry has carefully crafted a three-tea tasting set in the Sun Moon Lake region, planting Myanmar Assam, Taiwan wild mountain tea, and Hong Yu side by side. This article focuses on one of the paternal varieties—Taiwan's native mountain tea. The dry leaves of this black tea are dark brown, almost black, and after brewing, they present a complex flavor interwoven with earthy, malty, and smoky charcoal notes, with noticeable tannins and a faint fruity sweetness in the finish. Through detailed records of four infusions using the gongfu brewing method, as well as pairing attempts with banana bread and dark chocolate, we can fully understand the character traits of this wild variety. If you prefer black tea with a sweet, malty flavor, Front Street Coffee suggests comparing it with the Myanmar Assam version from the same series. [more…]

On a scorching summer day, cold brew tea has become the top choice for many coffee and tea lovers looking to beat the heat. Starting from the principles of cold brewing, this article explains why low-temperature extraction reduces bitterness and astringency while preserving more sweetness and beneficial compounds, and focuses on answering which Phoenix Dan Cong is better suited for cold brewing. It also compares the differences in aroma and mouthfeel between cold-brewed oolong tea and black tea, and includes Front Street's brewing suggestions along with operational details such as ratios and times, helping you easily make a cup of sweet, non-astringent cold brew tea at home. [more…]

When brewing coffee, under-extraction or over-extraction will both bring unpleasant flavors. Starting from the golden cup extraction standard, this article explains the origin of the 18%–22% extraction yield, and details how to judge whether coffee is under-extracted or over-extracted by tasting sour, sweet, bitter, and other flavor expressions. At the same time, for common extraction problems in home brewing, it provides practical suggestions for adjusting grind size, water temperature, and brewing rhythm, helping coffee lovers easily brew a balanced and tasty cup. [more…]

Stockpiled quite a few coffee beans at home—how long can they actually keep? Does the 12-month shelf life on the label equal the optimal flavor period? This article starts with the principles of coffee compound degradation, explains why improper storage causes coffee to lose its flavor prematurely, and offers practical ways to tell if coffee has gone bad. It also compiles preservation principles such as sealing, keeping cool, and keeping dry, analyzes the pros and cons of freezing coffee beans, and reminds you to drink them as soon as possible after opening the bag. If the coffee smells musty, has a moldy odor, or looks abnormal in color, Front Street recommends discarding it for drinking and repurposing it as a deodorizer instead, to avoid affecting your health and taste experience. [more…]