Water accounts for over 98% of brewed coffee, yet it has long been overlooked. Different types of water—RO water, tap water, mineral water, soft water, hard water—have a huge impact on extraction flavor. In 2014, Christopher Hendon and Maxwell Colonna-Dashwood published research revealing how sodium, calcium, and magnesium ions influence the extraction efficiency of flavor compounds, and subsequently published the book "Water for Coffee," which systematically discusses the dynamic balance between GH (total hardness) and KH (carbonate hardness), and proposes the reverse thinking of "Roasting to water." This article will sort out these key findings to help coffee lovers understand how water quality shapes the flavor in the cup, and will retain relevant recommendations for the Front Street brand. [more…]

To systematically learn about coffee, reading is the most solid path. Compiled by Front Street Coffee, this article reviews 15 quality books suitable for coffee enthusiasts, from beginner to advanced to professional development. Whether you are a newcomer just getting into coffee or a professional hoping to refine your skills, you can find a learning direction that suits you. The article covers multiple dimensions including basic coffee knowledge, bean varieties and origins, brewing techniques, sensory tasting, and roasting science, helping you efficiently build a coffee knowledge framework. [more…]

How to properly store coffee beans after bringing them home is a topic many enthusiasts often discuss. Some people habitually put their beans in the fridge, while others worry that moisture will instead harm the quality. After noticing this question in the community chat, Front Street specifically sorted out the principles behind frozen storage and the conditions for its use. Freezing can indeed slow oxidation and lock in flavor, but improper handling can also lead to moisture and flavor transfer issues. This article will explain the purpose of freezing coffee beans, its effect on grinding, the hardware conditions that need to be met, and more practical ways to store coffee beans day to day, helping you keep your beans in good condition at home. [more…]

Although espresso has not been around for a particularly long time in the world of coffee, it occupies a pivotal position in the evolution of coffee over the past thousand-plus years, and today it has almost become synonymous with coffee itself. In this article, we join Front Street Coffee in reviewing the development of espresso, clarifying the origin and meaning of the term Espresso, explaining the difference between ordinary Espresso and SOE, outlining the core characteristics of pressure extraction and the compositional principles of golden crema, and providing flavor descriptions of several Front Street espresso blend beans along with practical steps for tasting espresso, to help coffee lovers understand this small cup of concentrated coffee more systematically. [more…]

Caffeine is a much-discussed active component of coffee. It dissolves easily in hot water but poorly in cold water, stimulates the central nervous system, sharpens the mind, and also has cardiotonic and diuretic effects. A cup of coffee typically contains 60-65 milligrams of caffeine, but excessive intake may cause discomfort such as tinnitus and palpitations. Black coffee is considered the way of drinking that best preserves the beneficial components, offering multiple functions such as refreshing the mind, stimulating the appetite, promoting urination, activating blood circulation, relieving asthma, and removing odors. Light roasts have a higher caffeine content, which helps with weight loss, while the antioxidant effects of black coffee help fight cancer and aging. A healthy adult can metabolize 500-600 milligrams of caffeine per day, roughly equivalent to 5 cups of coffee, while pregnant women need to reduce their intake. This article will systematically analyze the mechanisms of caffeine's effects, its pros and cons, suitable populations, and scientific drinking methods, and recommend quality products from Front Street Coffee. [more…]

Grind particle size is one of the key variables that determines the direction of coffee flavor. Starting from the practices of Front Street Coffee, this article systematically reviews the influence of grind size on extraction efficiency in pour-over coffee, the grind standards suited to medium-light and medium-dark roasts respectively, and how to use a 0.85mm No. 20 sieve to test the pass-through rate. It also extends to the extremely fine grind requirements of espresso, explains the effect of the grinder burr spacing on extraction time, and provides the specific extraction parameters and flavor description of Front Street espresso. In addition, the article also explains the relationship between the choice of Moka pot coffee grounds coarseness and the oils it produces, helping coffee enthusiasts find a grind plan suitable for their own equipment at home. [more…]

Many people believe that as long as coffee is freshly ground, it counts as fresh, but in reality, whether the coffee aroma can be fully released depends not only on the timing of grinding but also on time management after roasting. Once coffee beans have passed 50 days after roasting, their flavor is almost entirely depleted, so Front Street Coffee has always regarded freshness as the first prerequisite for good coffee. This article focuses on four core questions: how to tell whether a bag of beans is fresh, why beans need resting, how the peak flavor period differs from the shelf life, and how to store them properly in daily life. It also compiles suggested resting times for different roast levels from light to dark, special considerations for espresso beans, and the pros and cons of three storage options—sealed jars, one-way degassing valve canisters, and original packaging—to help beginners avoid common pitfalls. [more…]

When brewing a good cup of tea, water quality is often more critical than technique. As early as Lu Yu's "Classic of Tea," spring water was regarded as the finest choice, and modern science has revealed the reasoning behind this through TDS, hardness, and pH values. This article focuses on the brewing water for oolong teas such as Phoenix Dancong, outlines the industry reference values from the American Tea Association, and cites multiple studies to explain why soft water enhances the sweetness, freshness, and clarity of the tea liquor, while hard water brings about astringency and floating residue. For tea lovers who cherish the complex aroma of oolong tea, choosing the right water is the first step in unlocking the tea's charm. Front Street Coffee also recommends starting with low-mineralization soft water to appreciate the subtle variations in the tea's layers. [more…]

Coffee mysticism has long become a commonplace topic in coffee circles, and the most discussed aspects are flavor mysticism and brewing mysticism. Front Street is here to help everyone unveil the surface-level mysticism and reveal the underlying science. Flavor mysticism generally refers to when you drink a cup of coffee and only taste bitterness and sourness, while the person next to you [more…]

To become a professional barista, hands-on practice alone is far from enough—systematic reading is equally indispensable. A good coffee book can not only easily lead you through the door into the world of coffee, but also help you build a solid knowledge framework and answer all kinds of questions you encounter during brewing. Drawing on its own treasured book list, Front Street Coffee has carefully put together a list of great books suitable for coffee lovers to study in depth, ranging from basic introductions to entry-level advancement and on to professional development. Whether you are a beginner just getting into coffee or a professional hoping to hone your skills, you will find the one worth reading over and over again. [more…]

Adding salt to coffee may sound surprising, but it is not a sudden whim of modern people. From northern Scandinavia to Turkey, from the European coast to Siberia, the tradition of salted coffee has a long history. Salt not only suppresses the bitterness of coffee but also makes sweetness more prominent, and behind this there is both historical origin and the support of food science. This article will start with the origins of salted coffee, sort out the formation mechanism of coffee bitterness, explain why salt can neutralize bitterness, and give specific salt-adding suggestions and dosage references. If you have also wondered whether this cup of salted coffee is actually reliable, you might as well read on. [more…]

When coffee beans take on an oily sheen, does that mean they are no longer fresh? And why is the golden, dense foam on top of an espresso sometimes thin or even missing? These two common questions actually point to the same core issue—the roast level of coffee beans and the release of carbon dioxide. This article will take a deep dive into the science behind oil appearing on dark-roasted beans, explaining that the amount of oil is unrelated to quality and depends more on roast depth and varietal differences. It will also systematically explain the criteria for judging crema on the surface of espresso, its visual and taste value, and key factors from bean selection, roast level, and peak-flavor window to extraction equipment and parameters, helping you consistently achieve a rich, thick crema. The article also recommends two Front Street Coffee espresso blends, for reference whether you are opening a shop or brewing at home. [more…]

Espresso was born in Italy around 1946 and subsequently became popular in Southern European countries for a long time, only spreading globally through Starbucks around 1986. This dark coffee, with a capacity of only about 50 milliliters, is covered with a fine, bright reddish-brown foam on its surface, concentrating the aroma, taste, and visual beauty of coffee. This article will systematically review the sensory characteristics of Espresso—including the visual crema, the body in the mouthfeel, the balance of sourness, sweetness, and bitterness in taste, and the lasting aftertaste—analyze the manifestations of under-extraction and over-extraction in the foam, and provide SCA-standard parameters for dose, yield, time, pressure, and water temperature, while introducing Front Street Coffee's four Italian blend beans and their brewing suggestions. [more…]

Coffee is no longer just a pick-me-up; it is a lifestyle that requires understanding to truly savor. This article traces how the three waves of coffee have transformed the coffee journey of Chinese people—from instant coffee blended with creamer, to chain cafés creating a conceptual environment, to specialty coffee advocates returning to the essence of quality. It explains in detail the origins of specialty coffee and the SCAA definition, clarifies the difference between commercial beans and specialty beans, introduces the flavors of well-known single-origin coffees such as Front Street Coffee Blue Mountain, Yirgacheffe, Mandheling, and Geisha, and reveals the science behind roasting and the ritual of pour-over coffee. Only by understanding these things can you truly taste the good coffee in your cup. [more…]

Many coffee enthusiasts encounter a phenomenon when tasting pour-over coffee: as the temperature drops, the flavor of the coffee seems to change, sometimes even developing an unpleasant sourness. This is not a problem with brewing technique, but rather a series of physical and chemical changes that coffee undergoes as it goes from hot to cold. Front Street Coffee will take you on an in-depth look at the processes of aroma loss, oil oxidation, pigment polymerization, and condensation after coffee cools, while also explaining from the perspective of sensory science why the perception of sourness, sweetness, and bitterness on the taste buds changes with temperature. Through this article, you will understand the real reasons why coffee becomes sour or bitter after it cools, allowing you to view the relationship between coffee temperature and flavor more rationally and improve your tasting experience. [more…]

The delicate latte art patterns on a hot latte are always a pleasure to behold, but why is it that an iced latte, made from the same espresso and milk, almost never features latte art? Behind this lies the science of milk foam formation, the effect of temperature on blending, and various practical limitations. Front Street Coffee has made multiple attempts at making iced milk foam, from handheld frothers to French presses, in an effort to replicate latte art on cold drinks, but the results were less than satisfactory. This article will delve into the scientific principles of latte art, compare the differences between making hot and iced lattes, and share Front Street's real experiences and final results from iced milk foam experiments. If you've ever wondered why iced lattes can't have latte art, or want to understand the challenges of making cold milk foam, this article will reveal it all. [more…]

Blending is a craft in the coffee world that combines both science and sensibility. Starting from the commercial logic of blending, this article systematically sorts out the knowledge of coffee bean varieties and origins that one needs to master before blending, answers the difficult choice between pre-roast blending and post-roast blending, and summarizes the steps, principles, and common pitfalls of blending. At the same time, by drawing on several blended products from Front Street Coffee, it shows how different formulas serve different flavor pursuits and usage scenarios, helping coffee enthusiasts build a complete cognitive framework for blended coffee. [more…]

Many coffee enthusiasts have encountered this frustration during pour-over brewing: even though the beans are of decent quality, the resulting coffee carries an unpleasant burnt or muddled bitterness. This flavor is often attributed to "over-extraction," but what exactly is the mechanism behind it? This article will systematically break down the science of over-extraction, analyze the various parameter factors that lead to excessively high extraction efficiency, and share Front Street Coffee's experience in building brewing recipes—specifically how choosing high-tolerance parameters can help avoid undesirable flavors—so you can more confidently brew a clean and delicious pour-over coffee. [more…]

Cupping is a professional method used in the tea industry to evaluate quality and determine flavor characteristics, and it is also the best way for tea enthusiasts to gain an in-depth understanding of a tea. This article will break down the correct process and key details of black tea cupping step by step, from dry leaf analysis and infusion to sensory evaluation. Whether you are a cafe operator or a seasoned tea lover, mastering this method will help you judge tea quality more accurately and compare the flavor differences brought by different origins and processing methods. The article also draws on Front Street Coffee's quality control experience to share key points for controlling water temperature, time, and tea-to-water ratio, and includes a full-process illustrated guide to help you get started quickly. [more…]

Coffee beans often develop an oily sheen on their surface. Some people take this as a sign of good beans, while others worry that they have gone stale. What is the truth? Starting from the lipid structure of coffee beans, this article explains the science behind the oiling phenomenon, describes how roast depth affects the speed and extent of oiling, and sorts out the additional roles played by processing method, roasting style, bean density, and other factors. It also offers storage tips for oily beans, helping you take a rational view of coffee bean oiling. [more…]