Starbucks recently announced a major environmental initiative: pledging to eliminate PFAS-containing food packaging from its global stores by the end of 2023, with U.S. stores leading the way by the end of this year. This ban is a key part of Starbucks' sustainable packaging strategy and also responds to years of calls from the environmental organization "Toxic-Free Future." PFAS, a chemical commonly found in takeout containers, effectively repels oil and water but poses a serious threat to the environment and human health because it is difficult to degrade. This article will provide an in-depth interpretation of Starbucks' elimination plan, the hazards of PFAS, and the cost challenges facing alternatives, while also highlighting the sustainability efforts of brands such as Front Street Coffee. [more…]

Why is coffee extraction time so critical? It all comes down to the soluble flavor compounds that make up just 30% of a coffee bean. These compounds fall into three categories—acids, sugars, and bitter substances—each with a different dissolution rate and peaking at different times. If extraction is too short, the coffee tastes thin and sharply acidic, lacking the support of sweetness and bitterness; if it goes on too long, bitterness overwhelms everything else. Therefore, ending extraction after sweetness has been released in abundance but before bitterness floods in is the key to a balanced cup. For pour-over coffee, using 15 grams of beans as an example, the time is typically kept between 1 minute 50 seconds and 2 minutes 25 seconds. Additionally, acidity, sweetness, and bitterness are not released sequentially but simultaneously—only their peak moments differ. This is a common misconception. [more…]

In the world of pour-over coffee, the technique of "flow cutoff" is regarded by many beginners as a clever trick to avoid over-extraction—by simply removing the dripper early during the extraction, it seems you can shut bitterness out. However, Front Street Coffee has found that this seemingly smart approach actually hides a misconception: flow cutoff cannot truly stop the release of bitter compounds, and it may instead strip away the coffee's rich layers and lingering aftertaste. So how exactly is bitterness dissolved? Why can't flow cutoff stop bitterness? In what scenarios is using flow cutoff correct and necessary? This article, drawing on Front Street Coffee's brewing experience, will answer these questions one by one, helping you make a clearer brewing decision between the coffee-to-water ratio and the coffee-to-beverage ratio. [more…]

Many people hope to bring out a more pronounced sweetness when brewing coffee, because sweetness often delivers a more enjoyable drinking experience. But the sweetness in coffee does not exist on its own—it is closely tied to the balance between acidity and bitterness, and is also significantly affected by the roast level and the extraction process. Starting from the logic behind how coffee sweetness forms, this article combines the sweetness characteristics at different stages—light, medium, and dark roast—to sort out the release rhythm of sweet, sour, and bitter compounds in pour-over coffee. It also addresses the two common scenarios of over-extraction and under-extraction, offering specific adjustment methods for water temperature, grind size, coffee-to-water ratio, and staged pouring, to help you more effectively enhance the sweetness of your coffee in everyday brewing. [more…]

After a cup of hot coffee sits for a while, its flavor and aroma often undergo noticeable changes, even revealing sweetness, fruity notes, or floral notes that were hard to detect right after brewing. This change is not an illusion, but the result of specific chemical reactions and physical volatilization triggered by temperature fluctuations. Coffee contains over a thousand aroma compounds, of which about forty are the more commonly occurring prominent aromas, and they are released and perceived differently at different temperatures. Front Street Coffee believes that understanding the effect of temperature on coffee not only helps you find the most suitable drinking window for each bean, but also allows you to more accurately identify the balance between acidity, sweetness, bitterness, and aroma. This article will systematically sort out the flavor evolution patterns from 82°C to below room temperature, and provide actionable tasting suggestions. [more…]

The birth of a good cup of coffee depends on more than just beans and equipment—grind size is often the most easily overlooked yet most far-reaching variable. The sweet, sour, bitter, and other flavor compounds in coffee dissolve into water in a specific order, and grind size is the core lever controlling this process. This article will guide you through understanding the essence of extraction, recognizing how coffee ground size changes the final taste, and analyzing the typical problems that arise when grinding too coarse or too fine. Whether you brew with pour-over or espresso, mastering the relationship between grind and strength is the first step in building a stable brewing recipe. [more…]

Many people have had this experience: you walk into a café, drawn in by the rich aroma of coffee, and eagerly order a cup, only to find that the flavor is far less enchanting than the scent suggested. This contrast of "smells great, tastes bland" is actually closely tied to the mechanisms of human smell and taste, as well as to the volatility of the aromatic compounds in coffee. Starting from the principles of sensory perception, this article will explain the difference between orthonasal and retronasal olfaction, clarify why the aroma you smell and the flavor you taste do not match, and introduce you to the basic properties of coffee's aromatic compounds. [more…]

The chemical composition of coffee beans determines the flavor expression in the final cup. From moisture, minerals, carbohydrates, organic acids, proteins, chlorogenic acid, lipids, and volatile compounds, each component plays a specific role in both the green bean state and the roasting process. Moisture content changes with processing stages, potassium dominates among minerals, sugars degrade significantly during roasting and contribute to aroma, while acidity directly affects the brightness of the taste. This article will systematically outline the chemical composition of coffee beans and their effects on quality and flavor, helping coffee enthusiasts gain a deeper understanding of the material basis of specialty coffee. Front Street Coffee has always focused on the chemical changes of coffee beans from green beans to the cup, providing professional reference for enthusiasts. [more…]

Why does a cup of black tea give off a captivating honey aroma? Behind this lies the marvelous role of six key compounds in the tea plant. Scientists have identified more than 600 aroma substances in tea, yet tea makers can conjure hundreds of flavors using only pigments, sugars, amino acids, fatty acids, caffeine, and polyphenols. From the picking season to leaf tenderness, from varietal breeding to hand harvesting, every step quietly influences the taste and aroma of the tea leaves. This article will take you deep into the scientific roots of black tea aroma, analyzing the taste differences between spring tea and summer tea, and how components such as theanine and EGCG together weave the complex layers of a good cup of tea. Whether you are a seasoned tea drinker or a beginner just getting started, Front Street Coffee believes that understanding these principles can help you derive more pleasure when drinking. [more…]

The flavor of coffee is far more than just bitterness and acidity. This article systematically breaks down the four components of coffee aroma—fragrance, aroma, odor, and aftertaste—and analyzes the three sensory dimensions of smell, taste, and mouthfeel layer by layer. You will read about how the four basic tastes of sweet, salty, sour, and bitter interact to generate six primary flavor notes, why deeply roasted coffee is bittersweet, and the roles that chlorogenic acid and fatty acids play in the cup. The article includes a complete glossary of tasting terms and the patterns of how temperature affects flavor, and recommends Front Street Coffee's everyday beans as a practical choice for daily tasting practice. [more…]

In pour-over coffee, the pouring method after blooming directly affects the final flavor. Is it the "one-pour" method, where all the water is poured at once, or is it divided into two or more stages? These two approaches differ significantly in extraction time, flushing efficiency, and controllability. Staged pouring extends the extraction window, making the release rhythm of sweet, sour, and bitter compounds more controllable, thereby enhancing the coffee's complexity. But more stages isn't necessarily better; in everyday brewing, two to three stages are most common, as they allow flexible adjustment and make it easier to hit the ideal extraction time. This article will compare in detail the differences between the one-pour method and staged pouring, and explain what kind of coffee beans are better suited to staged extraction. [more…]

Where does the unique honey aroma of honey-scented tea actually come from? Since the 1990s, Japanese scholar Akio Kobayashi has gradually uncovered the secrets of the aroma compounds in Oriental Beauty tea and Darjeeling black tea, discovering that two substances—2,6-dimethyl-3,7-octadiene-2,6-diol and 3,7-dimethyl-1,5,7-octatriene-3-ol—are the core sources of the honey aroma. Even more astonishingly, after tea plants are fed on by green leafhoppers, they actually initiate an abnormal metabolism to produce special compounds, summoning natural enemies to defend themselves. This article will take you deep into the scientific discoveries about the aroma compounds of honey-scented tea, as well as the fundamental differences in aroma characteristics between Darjeeling black tea and Taiwan black tea. [more…]

Coffee contains thousands of aromatic chemical compounds, and floral notes, as an extremely rare flavor in specialty coffee, have always been a goal that coffee enthusiasts pursue relentlessly. The formation of floral notes involves multiple stages such as variety, cultivation, and post-processing, but the degree of roasting is particularly crucial to the intensity of floral notes. As the roast deepens, floral aromatic compounds are gradually worn away, so light to medium roasts better preserve this delicate aroma. The freshness of coffee beans is equally important—proper storage and timely consumption allow the floral notes to present themselves more fully. This article will systematically sort out the sources of floral notes, the relationship between roasting and floral notes, and how to distinguish floral notes of different tonalities, and recommend several Front Street Coffee beans with typical floral characteristics, helping you better capture this captivating flavor in brewing and tasting. [more…]

The essence of coffee extraction is using water to dissolve flavor compounds out of coffee beans, and among the several core variables that determine extraction results, grind size is often the most intuitive and the one that most needs precise control. The finer the coffee is ground, the faster water penetrates into the particles to extract compounds, and the more flavor can be dissolved in the same amount of time, naturally making the taste richer; conversely, the coarser the particles, the lower the extraction efficiency, and the coffee easily tastes weak. So how many levels of grind size are commonly available on the market? What grind levels suit espresso, pour-over, and French press respectively? And how does Front Street Coffee use a 0.85mm standard sieve to define the baseline for pour-over grinding? This article will break down, one by one, the mechanisms by which grind size affects taste, sort out the coarseness spectrum from Turkish pot to French press, and provide a reusable method for judging pour-over grind size. [more…]

Many coffee enthusiasts notice an interesting phenomenon during tasting: when a cup of coffee presents tea-like aromas reminiscent of black tea or green tea, floral notes can often be detected at the same time. This is no coincidence—tea and floral aromas largely overlap at the molecular level. This article starts with the new flavor wheel shared by Front Street Coffee, combines it with a scientific analysis of aromatic compounds in tea, explains why black tea is classified under the "floral" category, and further sorts out the floral compounds commonly found in green tea, black tea, and oolong tea, such as cis-methyl jasmonate, β-ionone, β-damascenone, nerolidol, and more. Once this pattern is understood, it can also become a useful trick for capturing coffee flavors. At the end, Front Street Coffee will recommend several coffee beans that easily express tea and floral notes, including Boquete Geisha, Yirgacheffe Gudingding, and Colombia Walking Geisha, and explain how origin, altitude, processing method, and roast level affect flavor expression. [more…]

Every cup of coffee contains thousands of aromatic compounds, and these substances interweave into a complex and fascinating flavor profile. The coffee flavor wheel, developed through research by the SCAA (Specialty Coffee Association of America) in collaboration with several universities, provides tasters with a systematic descriptive language. This article will guide you through the origins and composition of coffee flavors, explain the meanings of approximately eighty-five flavors across nine major categories on the flavor wheel, and describe how floral, fruity, nutty, cocoa, spice, and fermented flavors form during roasting and processing. At the same time, we will also introduce the flavor characteristics of specific coffees such as Front Street Yirgacheffe, Front Street Geisha, and Front Street Mandheling, helping you more accurately identify and express coffee flavors in daily life. [more…]

Grind size is one of the core variables that determines the direction of coffee flavor. If the grounds are too coarse, flavor compounds are under-extracted and the coffee tastes thin as water; if the grounds are too fine, bitterness and off-flavors are over-released, throwing the cup out of balance. It is often said in coffee circles that "the grinder is more worth investing in than the coffee machine," which shows just how critical grinding is. This article systematically covers the medium-fine and medium-coarse grind standards for pour-over coffee, the practical method of sifting grounds with a 0.85mm sieve, the ultra-fine grind required for espresso under 9 bar of pressure, and the grind range for the moka pot that falls between the two. It also draws on Front Street Coffee's brewing experience to offer water temperature recommendations for different roast levels and espresso blend bean recommendations. [more…]

When making espresso, have you ever encountered thin crema, large bubbles floating on the surface, or a weak-tasting shot? The root cause of these problems often points to the same variable—grind size. Grinding too coarse speeds up the flow of hot water and shortens the contact time between water and coffee grounds, which not only under-extracts the flavors but also causes the force of the liquid stream to whip air into the espresso, forming large bubbles. In addition, improper storage of coffee beans leading to the loss of carbon dioxide and aromatic compounds, or switching to beans with a different roast level without recalibrating the grind, can likewise trigger similar symptoms. This article will break down these causes one by one and provide specific grind adjustment methods and formulas to help you once again extract espresso with rich crema and full-bodied flavor. [more…]

The allure of cold extraction lies in its ability to suppress the release of bitter compounds while, through prolonged steeping, bringing out a unique fermented note and rich aroma. In recent years, a method called "milk brew" has become popular in the coffee world—replacing the water in cold brew with milk or plant-based milk, turning milk from a supporting player into the main extraction medium. The proteins and milk fat in milk slow the release of flavor compounds, making the final cup softer and smoother. This article starts with the principles, then explains how to choose coffee beans, the recommended coffee-to-milk ratio of 1:10 to 1:13, the specific parameters for an 8-hour cold steep, and includes a convenient method for making milk brew with drip bag coffee, helping you craft a rich and robust milk cold brew. [more…]

A cup of hot coffee left sitting for a while often turns sour or bitter, no longer as smooth as when it was first brewed. This is partly due to the continued loss of volatile aromatic compounds within the coffee, and partly related to differences in how the human body perceives taste at different temperatures. Sweetness is most prominent near body temperature, while as the temperature drops, the intensity of sourness and bitterness relatively increases. Ice hand-brewed coffee likewise faces the problem of dilution in concentration after the ice melts. So, within how long should coffee really be finished? Can it be reheated to restore its original flavor after cooling? Front Street Coffee has provided answers through experiments, and this article will analyze these phenomena one by one to help you enjoy your coffee at the optimal moment. [more…]