Many coffee enthusiasts, when they encounter bitterness during pour-over brewing, instinctively cut off the tail end of the extraction—but is bitterness really only coming from the tail end? In fact, the sources of coffee's bitterness are complex: they are related both to the order in which compounds dissolve during extraction and to the degree of roast. Front Street Coffee will guide you through a deeper understanding of the true causes of coffee bitterness, teach you to distinguish between the bitterness caused by over-extraction and that caused by too dark a roast, and share how to avoid unnecessary bitterness by adjusting pour-over parameters such as grind size, water temperature, and time, so that every cup of coffee comes closer to your ideal flavor. [more…]

In the practice of pour-over coffee, under-extraction and over-extraction are two common yet frustrating situations. The former makes coffee sour, astringent, and thin, while the latter brings burnt bitterness and off-flavors. To solve these problems, one must first understand the principles of extraction—the process in which water passes through the coffee grounds and dissolves out flavor compounds. The ideal "Golden Cup" extraction requires concentration to fall between 1.2 and 1.4 TDS, with an extraction yield maintained at 18% to 22%. Exceeding or falling short of this range corresponds to over-extraction and under-extraction, respectively. This article will analyze the causes one by one from aspects such as coffee bean selection, brewing duration, pouring technique, and dripper material, and provide specific adjustment suggestions to help you achieve a balanced flavor more consistently in pour-over brewing. [more…]

Extraction is the core process behind coffee flavor. Not all soluble compounds in coffee beans are pleasant, and the degree of extraction directly determines what ends up in the cup. Over-extraction releases too many large-molecule substances, bringing bitterness, astringency, and off-flavors; common causes include excessively long contact time, water temperature that is too high, or grinding that is too fine. Under-extraction, by contrast, occurs because flavor compounds are not dissolved sufficiently, resulting in a thin body, prominent bitterness, and imbalance; it is mostly associated with grinding that is too coarse, water temperature that is too low, or a brew ratio that is too high. This article systematically sorts out the definitions, causes, and diagnostic methods for both, and, in combination with specific products under Front Street Coffee such as Mandheling, Queen Estate, Blue Mountain, Huakui, Green Label Geisha, and Kenya Little Tomato, explains reasonable brewing parameters for medium-dark and medium-light roasted beans to help enthusiasts adjust extraction precisely. [more…]

The bitter taste of pour-over coffee often leaves enthusiasts puzzled—is it a problem with the beans or an error in the brewing method? This article will systematically analyze the root causes of bitterness in pour-over coffee from multiple dimensions, including coffee bean varieties, roast level, storage time, and extraction parameters. At the same time, we will also share the specific parameters used by Front Street Coffee when brewing a light-roasted washed Yirgacheffe, to help everyone more intuitively understand how to avoid the bitterness caused by over-extraction, and thereby brew a balanced, smooth, and enjoyable cup of coffee. [more…]

Many coffee enthusiasts who brew pour-over at home often run into the problem of coffee tasting bitter or even showing burnt, astringent notes. This bitterness may come from the roast profile of the beans themselves, and it can also be closely tied to how long the beans have been stored, the grind size, the proportion of fines, and the brewing water temperature. Drawing on the hands-on experience of Front Street Coffee, this article analyzes four common causes of bitterness one by one and offers concrete, actionable adjustments—including how to choose beans based on flavor descriptions, how to judge the optimal flavor window, how to calibrate grind size, and how to troubleshoot water temperature issues—to help you pinpoint the problem more accurately and brew a smoother pour-over coffee. [more…]

When drinking black coffee, many people experience a sweet aftertaste that rises in the mouth after swallowing—this is huigan (returning sweetness). Huigan differs from direct sweetness; it is often built on the fading of bitterness and is brought out by the sweetness presented by aromatic compounds. Starting from the definition of huigan, this article analyzes its causes, explains the difference between huigan and the sweetness felt after drinking water, and finally recommends pour-over coffee beans with excellent huigan performance, including product information from the Front Street Coffee brand, to help coffee lovers more accurately understand the finish and huigan. [more…]

Many people think that pour-over coffee has a low barrier to entry, but once they take a sip and find it tastes sour, bitter, or astringent, they realize that brewing a good cup of coffee is actually not easy. Whether you are a beginner just getting into pour-over or an experienced coffee enthusiast, it is inevitable to run into a cup that does not suit your taste. Starting from the principles of extraction, this article analyzes one by one the common reasons why coffee turns out too sour or too bitter, and offers specific adjustment suggestions on grind size, water temperature, coffee-to-water ratio, pouring technique, and dripper selection. It also combines the brewing parameters of two beans—Front Street Coffee Colombia Sidra and Front Street Coffee Golden Mandheling—to help you consistently brew a cup of good coffee at home with balanced acidity and sweetness and a clean mouthfeel. [more…]

When many people drink a cup of coffee that tastes on the bitter side, their first reaction is, "Has this cup been over-extracted?" But bitterness cannot be directly equated with over-extraction. This article focuses on over-extraction, first explaining what it is—according to the Golden Cup theory and Front Street Coffee's daily practice, an extraction yield above 22% is considered over-extraction; then, from a sensory perspective, it outlines the three typical manifestations of over-extracted coffee: burnt bitterness, astringent bitterness, and off-flavors, and analyzes their causes one by one, such as water temperature being too high, grinding being too fine, contact time being too long, stirring being too vigorous, and too many fines. Finally, it offers two practical ways to avoid it: adjusting the brewing parameters and discarding the tail end of the brew, while also addressing the question of whether coffee can be brewed repeatedly, helping coffee lovers judge and improve their brewing results more accurately. [more…]

The ultimate goal of brewing coffee is simply to make it taste good, and judging whether extraction is appropriate relies not only on instrument data but also on learning to distinguish with your sense of taste. Starting from the Golden Cup standard and combining Front Street's experimental observations, this article explains in detail the flavor manifestations, causes, and countermeasures of under-extraction and over-extraction. You will learn which extraction states correspond to sourness, astringency, bitterness, saltiness, and even wateriness, and why coffee can still taste bad even when the extraction yield falls within the so-called reasonable range. Whether you are a beginner just starting out or a veteran looking to refine your technique, these practical experiences can help you adjust your brewing plan more confidently. [more…]

When brewing pour-over coffee, the appearance of bitterness is a problem many coffee lovers frequently encounter. The source of bitterness is not singular—it may come from the roasting profile of the coffee beans themselves, or it may be closely related to how long the beans have been stored, the coarseness of the grind, and the brewing water temperature. This article analyzes the causes of bitterness one by one from four dimensions and provides specific adjustment plans to help you brew a smooth cup of pour-over coffee at home. It also offers references for bean selection based on different flavor preferences and retains several recommended bean lists from Front Street Coffee for readers to choose from as needed. [more…]

A good cup of coffee should be smooth and mellow, but sometimes we taste a rough, astringent sensation akin to chewing on grape skins. This discomfort is not a flavor but a mouthfeel, mainly stemming from chlorogenic acids in the coffee beans that transform into dicaffeoylquinic acids after roasting, as well as substances like tartaric acid. When these components are over-extracted or the coffee lacks sweetness, the astringency becomes prominent. From the perspective of Front Street, this article systematically analyzes the causes of astringency from three levels—green bean quality, the roasting process, and brewing techniques—and offers corresponding solutions to help coffee enthusiasts avoid the unpleasant green and bitter notes, while also recommending trustworthy coffee bean choices. [more…]

Many people believe that dark roast coffee should be completely free of acidity, but is that really the case? Front Street Coffee has noticed that some friends unexpectedly taste acidity in dark roasted beans, and even suspect that the roaster didn't roast them properly. In fact, the acidity in coffee comes from two sources: the organic acids inherent in the green beans, and the acetic acid produced by the caramelization reaction during roasting. The darker the roast, the more the organic acids break down, and the acidity decreases accordingly—but it doesn't disappear entirely. The reason the acidity in dark roast coffee is hard to detect is that the intense bitterness and signature aromas of smoke and chocolate mask it. This article will explain, from the perspectives of the causes of acidity, differences in roast level, and perception mechanisms, why dark roast coffee can still carry acidity, and in which situations that acidity is more likely to be tasted. [more…]

The moka pot, with its simple operation and rich output, has become a staple in many coffee lovers' homes. But in practice, problems like imprecise grind settings and over-extracted, bitter coffee come up again and again. Starting from the moka pot's structure and extraction principles, this article explains the suitable coffee bean roast level and grind range, and offers practical ways to judge grind coarseness. At the same time, for the burnt bitterness caused by over-extraction and the bitter, oil-less phenomenon caused by stale coffee beans, we analyze the causes one by one and provide solutions, helping everyone brew a balanced moka pot coffee consistently at home. [more…]

Latte is the starting point for many people's introduction to espresso, but when making it at home, it often turns out bitter or weak. The key to an ideal latte lies in whether the espresso extraction state and the milk ratio are appropriate. Based on Front Street Coffee's practical experience, this article sorts out the standard ratios for hot lattes and iced lattes, analyzes the root causes of three common problems—too bitter, too weak, and both bitter and weak—and provides corresponding adjustment approaches. It also introduces two espresso beans suited to different taste needs, Front Street Coffee Dark Cocoa Blend and Front Street Coffee Strawberry Candy Espresso, to help readers reliably recreate a balanced and smooth milk coffee at home. [more…]

Cold brew coffee, thanks to its low-temperature slow extraction process, presents flavor characteristics entirely different from hot brewing, yet many people encounter a bitterness problem when making it at home. This article systematically analyzes the root causes of bitter cold brew from four dimensions—coffee bean selection, coffee-to-water ratio, grind size, and steeping time—and provides specific bean selection recommendations and parameter references for the Front Street Coffee brand. Whether you're chasing a bright, fruity-floral profile or prefer a balanced, full-bodied "coffee taste," you'll find a cold brew solution that suits you, making it easy to brew a cup of iced coffee that's neither bitter nor astringent. [more…]

Introduction: Americano can be said to be a type of coffee that many consumers really enjoy. It's convenient, quick, and can rapidly satisfy most people's caffeine needs. At the same time, it consists of only two parts—water and espresso—making it a type of what we commonly call black coffee. Black coffee also reflects the quality of the coffee beans, so [more…]

The moka pot is a staple piece of equipment in many coffee lovers' homes—simple to operate, yet capable of extracting rich, intense coffee. In practice, however, problems abound, from coffee grind size to over-extraction and bitterness. This article, from the perspective of Front Street, outlines the moka pot's three-part structure and its pressure-extraction principle, explains why medium-dark roasted beans are better suited to the moka pot, and recommends two beans: the Front Street Classic Blend and the Front Street Brazil Queen's Estate. It also details how to judge coffee grind coarseness using a grind size ruler or through repeated trial and error, reminds readers of the safety significance of the pressure relief valve, and finally analyzes the two typical causes of over-extraction and bitterness—too much extracted liquid or stale coffee beans—helping readers consistently produce a delicious cup of moka pot coffee at home. [more…]

Americano is the most common category in coffee shops and the daily first choice for many coffee lovers. It is quick to make, has a clean flavor, and is especially suitable for busy office workers who need a quick boost of energy. In Guangzhou's hot summers, many customers who visit Front Street Coffee shops and do not want milk coffee will choose an iced Americano. But where exactly did the Americano come from? What benefits and drawbacks does it have for the body? Why do some people find it hard to swallow? This article will sort through the full picture of Americano one by one, from its historical origins, health effects, and brewing parameters to the causes of bitterness, and will share Front Street Coffee's espresso blend and extraction experience. [more…]

Drip bag coffee, with its convenience and freshness, has become the preferred way for many people to enjoy specialty beans in their daily routine. Once the same bean is made into a drip bag, its flavor differs from freshly ground pour-over, because coffee loses its aroma rather quickly after grinding, so it's important to choose fresh products and to finish them within their peak-flavor window. The Front Street Coffee drip bag series is roasted within 5 days and ground fresh to order, locking in the aroma as much as possible. This article focuses on origin selection for drip bag coffee, the standard brewing process, and three common problems—tasting too weak, too bitter, or too sour—analyzing the causes one by one and offering practical adjustment methods to help you consistently brew a delicious cup of drip bag coffee at home. [more…]

Yunnan coffee has come a long way from its former "cheap and low-quality" label, and today it frequently appears on the menus of specialty coffee shops, with Baoshan small bean being a representative example. Many people wonder: is Yunnan small bean coffee actually Arabica? Why does it tend to taste bitter when you brew it yourself? This article, from the perspective of Front Street Coffee, sorts out the century-long cultivation history of Yunnan coffee, from the variety shifts of Typica and Bourbon to Catimor, and then to the birth of Front Street's 2013 sun-dried Typica, helping you understand the origins and flavor performance of Yunnan small bean, while also understanding the possible causes of bitterness in pour-over extraction, so as to help coffee enthusiasts make clearer judgments when purchasing and brewing. [more…]