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 coffee enthusiasts pursuing precise extraction, the ATAGO refractometer is a common professional tool. This article focuses on three coffee refractometers under the brand—4523, 4532, and 4533—sorting out their differences and purchasing advice, and addresses questions about accuracy comparisons with the VST LAB. Then, using the 4532 TDS model as an example, it explains step by step the practical essentials such as the unboxing checklist, battery installation, zero calibration, concentration measurement, and extraction yield calculation. The article also particularly reminds readers of easily overlooked details such as zeroing frequency, sample temperature, and cleaning taboos. If you are currently using or considering purchasing an ATAGO refractometer, this guide will help you avoid common pitfalls and make every measurement more reliable. Front Street Coffee also emphasizes the standardized use of such instruments in daily quality control. [more…]

In the Golden Cup extraction theory, extraction yield and concentration are the two core metrics for assessing the flavor state of coffee. However, coffee that falls within the ideal range is not necessarily delicious, and coffee outside the range is not necessarily undrinkable—the key lies in how to use these two values to help adjust the brewing plan. From the perspective of Front Street, this article first clarifies the basic definitions and ideal ranges of extraction yield and concentration, then explains in detail how to use two sets of concentration measuring tools, and finally uses the Santa Vini anaerobic natural beans as an example to fully demonstrate the entire process from weighing the liquid weight to plugging it into the formula to calculate the extraction yield. [more…]

In a cup of black coffee, water makes up the vast majority, so its impact on flavor must not be underestimated. Different brands of drinking water vary in mineral composition, hardness, and pH, so the coffee brewed with them naturally takes on different characteristics. To investigate this variable, Front Street Coffee selected four common drinking waters—Baisui Mountain, Nongfu Spring, Ganten, and C'estbon—and used the same Costa Rica Mozart coffee beans to make cold brew, measuring TDS, coffee liquid concentration, and recording flavor performance one by one. The experiment found that the amount of calcium and magnesium ions in water affects extraction efficiency and taste direction, while Nongfu Spring with medium TDS and C'estbon purified water each showed distinct stylistic differences. This article will present the full experimental process and tasting results, and offer water selection suggestions for different taste preferences. [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…]

Front Street Coffee received a question from an enthusiast who wants to know how to get started with coffee concentration measuring instruments like ATAGO. This article will demonstrate the operating procedure of the instrument step by step, explain the meaning of the two readings, Brix and TDS, and show how to use the measured TDS value to calculate the coffee's extraction yield. The article will also introduce the two core standards of the Golden Cup theory—extraction yield of 18%–22% and concentration of 1.2%–1.45%—as well as the flavor characteristics brought by under-extraction and over-extraction, helping you more accurately judge whether a cup of coffee falls within the ideal range in your daily brewing. [more…]

Espresso is the foundation of the Italian beverage system, and Americano, latte, cappuccino, flat white, and mocha are all derived from it. This article centers on the extraction principles of espresso, sorts out its historical origins and flavor differences with Americano, and introduces in detail the positioning and characteristics of four espresso blend beans from FrontStreet Coffee. At the same time, the article also compiles reference standards for Italian-style extraction such as dose, liquid weight, and time, explains TDS measurement and the calculation method for extraction yield, and finally includes the seven-step espresso-making process and extraction scheme used in FrontStreet stores, for coffee enthusiasts to systematically understand the making and tasting of espresso. [more…]

Espresso is the foundation of various Italian-style beverages such as Americano, latte, and cappuccino. It is extracted by forcing approximately 92°C hot water under high pressure through a finely ground and compacted layer of coffee powder using an espresso machine. This article focuses on the extraction standards for espresso, covering the coffee-to-water ratio, extraction time, TDS measurement, and the calculation method for extraction percentage, and outlines the complete operational steps from wiping the portafilter basket to cleaning the group head. It also introduces the recipe concepts and flavor characteristics of Front Street Coffee's four espresso blend beans, as well as the espresso extraction protocol used in Front Street Coffee shops, providing a systematic reference for coffee enthusiasts. [more…]

The world of espresso is built on the foundation of espresso, from which Americano, latte, cappuccino, flat white, and mocha are all derived. Espresso is made by forcing hot water at about 92 degrees through a finely ground and compacted layer of coffee under high pressure, extracting a liquid rich in flavor and relatively high in caffeine per unit. Americano originated during World War II, when American officers diluted espresso with water to mimic the taste of drip coffee, a practice that also carried a hint of European mockery. Front Street Coffee uses a hot Americano water-to-liquid ratio of about 1:4.5, and an iced Americano ratio close to 1:9, and offers four espresso blend beans to meet different needs. This article will also explain in detail the extraction standards, the effects of grinding and time on flavor, TDS measurement, as well as the seven-step espresso-making process and in-store extraction solutions, helping enthusiasts understand the logic behind a cup of espresso. [more…]

Espresso was invented by MR. Gaggia in 1946. Gaggia further improved the piston pressure system—using spring pressure instead of manual pressing, so that the brewed coffee is topped with a layer of golden coffee crema (Crema), which is Crem [more…]

Compared to other coffee-making methods, espresso machines are much more demanding when it comes to coffee beans. To allow the coffee to release quickly, we need to grind the beans very fine and use high-temperature and high-pressure extraction conditions, which makes the coffee taste extremely intense—and one wrong move can turn the espresso into something utterly undrinkable. If you want to improve your espresso [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…]

Although most people come to Front Street Coffee to drink pour-over coffee, there are also quite a few who are willing to drink espresso. As is well known, espresso is the foundation of various Italian-style drinks—including Americano, latte, cappuccino, flat white, mocha, and more. According to Front Street Coffee, espresso is called "espresso" by foreigners, [more…]

Although most people come to Front Street Coffee for pour-over coffee, quite a few are also willing to drink espresso-based coffee. As we all know, espresso is the foundation of various Italian-style drinks—including Americano, latte, cappuccino, flat white, mocha, and so on. According to Front Street Coffee, espresso is called "espresso" by foreigners, [more…]

For more specialty coffee knowledge, please follow: Front Street Coffee (Frontsteet Coffee). Although most people come to Front Street for pour-over coffee, quite a few are also willing to drink espresso-based coffee. As we all know, espresso is the foundation of various Italian-style drinks—including Americano, latte, cappuccino, [more…]

Espresso is the common foundation of drinks such as Americano, latte, and cappuccino. Understanding its extraction principles and operating procedures is the key to making a good espresso. This article will start with the definition and extraction principles of espresso, then outline the origin and preparation ratios of Americano, introduce the flavor characteristics of Front Street Coffee's four espresso blends, and explain in detail the extraction parameters such as dose, yield, and time. Finally, it will provide the standard operating steps from wiping the portafilter basket to pressing the button to extract, as well as simple methods for hot Americano, iced coffee, and hot latte, making it suitable for enthusiasts who want a systematic understanding of espresso. [more…]

Espresso is the base for many drinks such as Americano, latte, and cappuccino, and its preparation relies on high-pressure hot water passing through a finely ground and compacted layer of coffee. From the perspective of Front Street Coffee, this article sorts out the extraction principles of espresso, compares the historical origins and ratio differences of Americano, introduces the flavor positioning of Front Street's four espresso blend beans, and provides extraction standards such as dose, yield, and time. Finally, it includes the seven-step process for in-store practice and extended drink-making methods, making it suitable for coffee enthusiasts who want to systematically master espresso preparation and bean selection ideas. [more…]

Espresso is the foundation of all Italian-style drinks; americano, latte, cappuccino, flat white, and mocha are all derived from it. Starting from the actual store operations of Front Street Coffee, this article systematically sorts out the logic of using a semi-automatic espresso machine: first clarifying the high-pressure extraction principle of espresso, then comparing the historical origins and flavor differences between Italian and American styles, followed by a detailed explanation of the positioning of Front Street's four espresso blends, and finally providing core extraction parameters such as dose, yield, and time along with a seven-step operating procedure. Whether you are a beginner just getting started with a semi-automatic machine or a coffee enthusiast looking to optimize your output, you can find practical reference solutions here. [more…]

Espresso is the core foundation of the Italian beverage system, from which Americano, latte, cappuccino, flat white, mocha, and others are all derived. Drawing on the hands-on experience of Front Street Coffee, this article sorts out the extraction principles and standard parameters of espresso, compares the historical origins and taste differences between Americano and Italian-style coffee, and introduces the recipe concepts and flavor orientations of Front Street's four Italian-style blend beans. At the same time, the article also provides a complete list of the seven steps for making espresso, along with specific recommendations for dose, liquid weight, time, and more, helping coffee enthusiasts understand the logic behind bar operations so they can more consistently produce a qualified cup of espresso at home or in a shop. [more…]

The Golden Cup extraction system is a quality reference framework widely recognized in the global coffee industry, and its core lies in controlling the concentration and extraction yield of the coffee liquid within a specific range. Compiled by FrontStreet Coffee, this article systematically reviews the origins of the Golden Cup standard and the differences in national standards, explains in detail the formulas for extraction yield and concentration, and uses a VST refractometer and a brewing example with Ethiopia Huakui 4.0 to demonstrate how to measure concentration and calculate extraction yield. At the same time, the article also discusses the influence of the pour-over coffee grounds-to-water ratio on flavor, gives a recommended ratio of 1:15 suitable for most bean varieties, and helps coffee enthusiasts build a quantifiable approach to brewing adjustments. [more…]