In coffee brewing, how to balance flavor and avoid under-extraction or over-extraction is a concern for every coffee enthusiast. The Golden Cup standard provides a widely recognized reference framework, covering the ideal ranges for extraction yield and concentration. This article will systematically review the origins of the Golden Cup standard and the specific values set by coffee associations in various countries, explain in detail the formulas for calculating concentration and extraction yield, and, using the example of Front Street Coffee's Ethiopia Florque 4.0 pour-over, demonstrate how to measure and calculate extraction yield with an ExtractMoJo refractometer, helping you find the flavor balance point that suits you in your daily brewing. [more…]

Many coffee enthusiasts have heard of the Golden Cup extraction theory: ideal concentration 1.15%-1.35%, ideal extraction yield 18%-22%. But this standard actually comes from the SCAA, not the SCA; the European and American coffee associations each have their own positions on ideal concentration. After the SCAA and SCAE merged in 2017, the UC Davis Coffee Center made slight adjustments to the old brewing control chart, loosening the upper concentration limit and the brew ratio range. This article will start with the history of the Golden Cup theory, sort out the differences between the old and new control charts, explain why high concentration with low extraction can highlight acidity while low concentration with high extraction can bring out floral and chocolate notes, and, combined with product information from Front Street Coffee, help you understand how concentration and extraction yield should be judged together, rather than fixating on a single number. [more…]

The extraction standards for espresso have always been a core topic of interest for coffee enthusiasts. The SCAA once defined it as 9-10 atmospheres of pressure, 7-9 grams of coffee grounds, water temperature of 88-92°C, and extraction of 45ml in 22-28 seconds, but today the actual operating parameters of specialty coffee shops have clearly diverged from this. Starting from the practical experience of Front Street Coffee, this article reviews the evolution of espresso extraction parameters along with roasting trends and equipment technology, analyzes the influence of the five major variables—dose, water temperature, time, pressure, and grind size—and introduces the flavor performance of Front Street Sunflower Warm Sun blend beans as well as the correct way to taste espresso. [more…]

What standards are actually used to classify the light, medium, and dark roasts commonly seen on coffee bean packaging, along with names like Cinnamon, City, and French? This article starts with the eight-level roast color card developed by the SCAA (Specialty Coffee Association of America) and the Agtron company, explaining how Agtron color values correspond to drop time, and groups the eight levels into four major categories: light, medium, medium-dark, and dark, explaining the flavor characteristics of each stage. The article also uses Front Street Coffee's Yirgacheffe Gidding and PWN Golden Mandheling as examples, fully presenting the roasting curve from charge temperature, adjustments to heat and airflow, to first crack development and drop timing, as well as the brewing parameters and flavor descriptions for the V60 and KONO Meimon drippers, making it easy for enthusiasts to build a corresponding understanding of roasting and extraction. [more…]

The Golden Cup extraction is a concept often mentioned in coffee circles. It uses two indicators—concentration and extraction yield—to judge whether a cup of coffee has been properly extracted. This theory can be traced back to 1952, when it was developed through collaborative research by the American coffee association and Dr. Lockhart of MIT. After multiple revisions, the Golden Cup range currently recognized by the SCAA is: extraction yield 18%-22%, concentration 1.15%-1.35%. But the Golden Cup numbers are only a reference tool, not an absolute formula for brewing delicious coffee. This article will walk you through the origins and development of Golden Cup extraction, the meaning of concentration and extraction yield, how to calculate extraction yield using formulas, and why you should not be limited by the Golden Cup range. [more…]

For enthusiasts who are just getting into pour-over coffee, the coffee-to-water ratio is often the first source of confusion: exactly how much coffee grounds should be paired with how much water? Starting from the hands-on experience of Front Street Coffee, this article systematically sorts out the definition of pour-over coffee, the logic for determining the coffee-to-water ratio, the concentration range of the SCAA Golden Cup extraction standard, and the seven major factors that affect extraction. The article not only provides the calculation basis for the general parameter of 1:15, but also explains in detail key steps such as grind size correction, water temperature selection, and dripper choice. Finally, it includes the specific brewing recipe and flavor description for Front Street Yirgacheffe Gedingding, helping beginners build a complete framework of pour-over knowledge. [more…]

For more specialty coffee knowledge, please follow our WeChat official account: FrontStreet Coffee. When it comes to brewing coffee, many people like to ask how many grams of coffee grounds to use and what the coffee-to-water ratio should be. Ultimately, what people really care about is the coffee extraction rate. Need [more…]

With the development of the specialty coffee market, single-origin coffee is increasingly recognized by the public, so many coffee enthusiasts are teaching themselves how to brew pour-over coffee at home. As a result, coffee-loving friends often ask, when buying coffee beans at Front Street Coffee, how the coffee-to-water ratio for pour-over coffee should be determined. So in this next article, Front Street [more…]

Front Street Golden Mandheling is the bean with the highest body and the most pronounced bitterness on the menu, and it is also Front Street's top recommendation for customers who prefer strong, bitter coffee. Many customers ask about brewing parameters when ordering, so in this article Front Street will systematically explain how to brew Front Street Golden Mandheling to bring out its authentic Mandheling character. The content covers how the wet-hulling process shapes the distinctive woody, spicy, and herbal notes of Indonesian coffee, the quality characteristics of Front Street Golden Mandheling as a signature product of PWN, and the specific parameters for pour-over brewing, including grind size, water temperature, dripper selection, and three-stage pouring. Whether you are a beginner just getting to know Mandheling or a seasoned coffee drinker looking to refine your pour-over skills, you will find practical brewing ideas here. [more…]

Coffee extraction is the key step that determines flavor. About 30% of coffee beans consists of soluble substances, including both aromatic components and mouthfeel-related compounds, and a higher extraction yield does not necessarily mean better quality. This article systematically introduces concentration measurement methods (refractometer, conductivity pen, evaporation and drying), explains the extraction yield conversion formula in detail, and provides specific calculation steps for different brewing devices such as immersion, pour-over, and espresso. It also includes the golden cup concentration recommendations from the SCAA and SCAE, as well as relevant product information from the Front Street Coffee brand, to help enthusiasts understand extraction more scientifically. [more…]

For enthusiasts who are just getting into pour-over coffee, one of the first things that often causes confusion is how many grams of coffee to use for a single serving, and how to calculate the water-to-coffee ratio for two people. Starting from Front Street Coffee's practical experience, this article systematically explains the principles of distributing the coffee-to-water ratio in pour-over brewing. Combined with the strength recommendations of the SCAA (Specialty Coffee Association of America), it provides the widely applicable parameter range of 1:15, and further analyzes the seven major elements of pour-over brewing—from coffee bean freshness, grind size calibration, and water temperature control to dripper selection and brewing time. The article also includes the specific brewing data and three-stage extraction method for Front Street Yirgacheffe Washed Gedingding, helping readers, on the basis of understanding the principles, reduce operational mistakes and consistently brew a clean-tasting cup of good coffee. [more…]

The roast level of coffee beans often directly determines the flavor expression in the final cup. When confronted with terms on packaging such as light roast, medium roast, dark roast, and even cinnamon roast, city roast, and French roast, many friends new to specialty coffee are often confused. From the perspective of Front Street Coffee, this article first sorts out the eight-tier roast standards established by the SCAA based on Agtron color values, then groups them into two major categories—light and medium—explaining their respective flavor tendencies. It then uses the light-roasted Yirgacheffe Gedeb Cooperative and washed beans, along with the medium-dark roasted Front Street PWN Golden Mandheling as examples, fully disclosing the roast curves and brewing parameters for the V60 and KONO Meimon drippers, helping readers build a systematic understanding from roasting to extraction. [more…]

How exactly should the extraction yield and strength of pour-over coffee be calculated? The golden cup extraction yield range defined by the SCAA is 18% to 22%, corresponding to a TDS strength of about 1.15% to 1.35%, while the coffee-to-water ratio falls within the range of 1:12 to 1:15. This theory originates from Dr. Lockhart's scientific experiments in the 1950s, in which he quantified coffee flavor and laid the foundation for the golden cup standard. This article starts from the daily brewing at Front Street Coffee, explains the definitions of extraction yield and strength, the conversion formulas, and how to use a refractometer, and, using beans from Panama's Elida Estate as an example, fully demonstrates the parameter settings, pouring rhythm, and extraction yield calculation process of a staged pour-over, helping coffee enthusiasts understand the practical application and reference value of the golden cup theory. [more…]

Many coffee enthusiasts have encountered this confusion: for the same beans, why does the taste always differ between what you brew yourself and what a Front Street barista brews? In fact, this involves two core concepts—extraction yield and concentration. This article, based on the daily experience of Front Street Coffee (FrontStreet Coffee), systematically explains what coffee extraction yield is, how to measure extraction yield using a TDS concentration meter, and the conversion relationships in the SCAA Golden Cup standard among 18%–22% extraction yield, 1.15%–1.35% concentration, and a 1:12–1:15 coffee-to-water ratio. The article also reviews the historical origins of the Golden Cup theory and, using Front Street's brewing of Panama Elida Natural Typica as an example, provides complete staged pouring parameters and the extraction yield calculation process, helping you brew a cup of pour-over coffee at home that is not over-extracted and has a pleasing flavor. [more…]

What standards actually determine whether a coffee bean package is labeled light, medium, or dark roast? What flavor directions correspond to different roast levels? Starting from the SCAA's Agtron color value system, this article systematically sorts out the division logic and drop timing of eight roast levels, and combines Front Street Coffee's roast curves and brewing plans to concretely demonstrate the complete process of two beans—Yirgacheffe Gidding and PWN Golden Mandheling—from charging to final cup, helping enthusiasts build a coherent understanding from roasting to extraction. [more…]

In the world of specialty coffee, the SCAA and COE are two authoritative systems that cannot be overlooked. The former established industry standards and cupping protocols, while the latter selects top-tier green beans through rigorous competitions. How do their scoring logics differ? And why are COE and SOE often confused? This article will trace the development and operational mechanisms of the SCAA, CQI, and COE, explain in detail the differences in cupping score sheets, and use the example of the 22nd-place sun-dried Typica that Front Street Coffee bid for at Ethiopia's first COE competition in 2020 to present the complete story from origin to cup. [more…]

What is specialty coffee? According to the Specialty Coffee Association of America (SCAA), specialty coffee is, in short, coffee obtained through good green beans, good roasting, and good extraction. The so-called "SOE" is actually "Single Origin Esp [more…]

Indonesian Sumatra Mandheling coffee has always been known for its full body and herbal aroma, but many enthusiasts find that ordinary Mandheling often falls short in terms of cleanliness. Front Street Coffee's PWN Golden Mandheling, however, is highly popular for being almost acidity-free, high in cleanliness, full-bodied, and carrying herbal spice notes. This article will analyze in detail the fundamental reasons for the difference in flavor cleanliness between Golden Mandheling and ordinary Mandheling from perspectives including Indonesian coffee-producing regions, the terroir conditions of Mount Gayo in Aceh, PWN company's quality control system, and wet-hulling processing. At the same time, Front Street Coffee will also share green bean analysis, roasting suggestions, cupping reports, and brewing insights for this bean, helping you gain a comprehensive understanding of this deeply beloved coffee. [more…]

The roast level of coffee beans directly affects the final flavor profile, but the labeling methods on the market are diverse, ranging from light roast to cinnamon roast, often leaving beginners confused. This article, from the perspective of Front Street, systematically sorts out the definition standards and flavor characteristics of coffee roast levels. Using the SCAA's Agtron color value system, it divides light to dark roasts into eight levels and explains the dropping timing and flavor performance of each stage one by one. At the same time, the article also shares how to infer the roast level from flavor descriptions, the bean selection logic for espresso, and the pour-over grind size and water temperature parameters corresponding to different roast levels, helping you accurately judge and brew a good cup of coffee even when labeling is lacking. [more…]

When it comes to Indonesian Mandheling, the most famous and popular is undoubtedly the Golden Mandheling coffee beans produced by the Indonesian PWN company. Many people come to try Golden Mandheling coffee and decide to buy the beans to brew at home, but they can never replicate the taste they had in the coffee shop. Why is that? [more…]