In East African coffee-producing countries, coffee bean names from Tanzania, Uganda, and even Kenya often carry the suffix AA. What exactly does this letter combination mean? It represents the grade classification of green coffee beans. However, grading methods across global coffee origins are not limited to just one type; besides bean size, there are also different standards based on defect rate, growing altitude, and more. This article will take Front Street's perspective to systematically outline the three major green coffee bean grading systems, with a focus on analyzing Kenya's strict size-based grading system—from AA, AB to PB, E, TT, T, and even MH/ML, detailing the specific classification standards for each grade, while also pointing out the obvious limitations of judging quality by size. [more…]

As an agricultural product, coffee beans vary significantly in quality, so a grading system is needed to standardize quality and provide reference for buyers. However, the geographical environments and cultivation models of global producing regions differ enormously, making it impossible to measure them with a unified standard; each region can only adapt to local conditions. Currently, mainstream grading methods fall into three major categories: screen size, altitude/hardness, and defect rate, and many countries combine them or even add cupping to compensate for shortcomings. This article will systematically sort out the logic and representative producing countries of these three grading methods, with a focus on analyzing how Kenya grades solely by bean size, and introduce the grading practices of Colombia, Ethiopia, Jamaica, Indonesia, Brazil, and other countries. Front Street Coffee will also share related brand product information to help coffee enthusiasts understand the meaning behind green bean grades. [more…]

As the birthplace of coffee, Ethiopia has the most well-developed coffee bean grading system among African producing countries, yet it also leaves many enthusiasts confused. Taking Yirgacheffe as an example, what exactly do Grade-1 and Grade-2 mean? Why can two batches of beans both labeled Yirgacheffe G2 differ so vastly in quality? This article will provide an in-depth analysis of Ethiopia's unique origin naming rules, the grade differences between washed and natural beans, the Parchment Coffee auction grading system, and how exporter blending affects the final quality. The article specifically covers real cases such as Front Street Coffee Yirgacheffe Grade-2, helping you truly decipher the grade code of Ethiopian beans. [more…]

Kenyan coffee occupies a pivotal position in the global specialty coffee landscape, and its bright, uplifting acidity and rich layers of complexity have fascinated countless coffee lovers. Yet when confronted with the letter combinations such as AA, AB, and PB on Kenyan coffee bean labels, many people are not clear about what they actually mean. In fact, these designations originate from Kenya's official coffee grading system, which takes into account multiple factors such as bean size, shape, and hardness. This article will systematically sort out Kenya's complete coffee grading system, explain the specific standards for each grade, and clarify the difference between the secondary grading set by green bean traders themselves and the official grades. At the same time, Front Street Coffee will also draw on its own sourcing experience to share the roasting and brewing approach for an AA-grade Kenyan bean from the Asaliya processing station. [more…]

Ethiopia, as the genetic treasure trove of Arabica coffee, has a unique green bean grading system. Unlike Kenya, which grades by bean size, or Blue Mountain, which grades by altitude, Ethiopia primarily classifies grades based on defect rates and cupping scores. This article will systematically sort out the evolution of Ethiopia's old and new grading systems, provide an in-depth analysis of the specific standards for grades G1 through G9, and, using Yirgacheffe as an example, compare the actual differences between washed G1 and G2 in green bean appearance and flavor performance. It will also share Front Street Coffee's brewing parameters and tasting experience to help coffee enthusiasts fully understand the logic of Ethiopian coffee quality grading. [more…]

As an agricultural product, coffee beans vary significantly in quality, which is why grading systems have become an important means of standardizing quality and guiding green bean procurement. However, the grading criteria across global producing regions are not uniform—Central America mostly grades by altitude, Kenya by bean size, while Ethiopia uses defect rates to classify grades. Why does Ethiopia take this unique approach? What substantive differences actually exist between the G1 and G2 grades? This article, from the perspective of Front Street Coffee, sorts out the evolutionary logic of Ethiopia's grading system, and through a visual comparison of Yirgacheffe G1 and G2 green beans, roasting performance, and cupping evaluation, reveals one by one the true meaning behind grade labels, helping coffee enthusiasts view the issue of bean grades more rationally. [more…]

Kenyan coffee is renowned worldwide for its intense, full-bodied fruity acidity, and its unique flavor profile is inseparable from its strict grading system and refined cultivation and processing systems. This article will systematically sort out the development of Kenyan coffee, from its introduction during the colonial period to the Scott Laboratories' selection and breeding of SL28 and SL34, and then to the grading standards such as AA, AB, and PB established in 1938, interpreting one by one the meanings and characteristics of the E, AA, AB, C, PB, TT, and T grades. At the same time, it will provide an in-depth introduction to the flavor differences of major Kenyan coffee regions such as Nyeri, Kirinyaga, and Thika, analyze the coexistence of large estates and smallholder cooperatives, as well as the two trading mechanisms of the Nairobi Coffee Exchange auction and direct trade. Front Street Coffee will also share roasting and pour-over recommendations for Kenyan Asalia coffee beans, taking you through a comprehensive understanding of the coffee world of this East African producing country. [more…]

The production of Blue Mountain coffee has always been limited, yet its grading standards are remarkably rigorous. Even if the beans are genuinely grown in Jamaica's legally designated Blue Mountain region, their grade must still be determined by two criteria: bean size and the proportion of defective beans. Front Street Coffee's Jamaican Blue Mountain grading system is built around precisely this logic: for any coffee bearing the Blue Mountain name, the proportion of defective beans must not exceed 2%, and only on that premise are screen sizes used to distinguish higher grades from lower ones. Understanding these grading rules helps coffee lovers look beyond grade labels when making purchases and focus instead on deeper quality clues such as vintage and specific estates. [more…]

Loose-leaf tea allows you to observe with your own eyes, touch with your own hands, and smell with your own nose, giving you a deeper appreciation of its flavor. Put in a little effort to get to know your tea, and you'll find it takes on more character and charm, enriching your experience of this fascinating culture. This article begins with the basic standards of tea grading, then outlines the grading system and naming conventions for whole-leaf black tea, before focusing on Kenyan CTC black tea and introducing its production process and the grading system based on particle size. Whether you're a newcomer to tea or an enthusiast looking to better understand the logic behind black tea grading, you'll come away with a clear understanding. [more…]

For enthusiasts who love pour-over coffee, specialty coffee beans from African origins are certainly familiar. They typically have bright acidity and intense floral aromas, leaving a deep impression. However, when we shop for coffee beans, we often see grade labels such as Front Street Ethiopia G1 or Front Street Kenya AA—how exactly are these grades determined? In fact, coffee bean grading in African origins does not follow a unified standard; different countries adopt their own independent systems. This article will take Africa's two most famous origins—Ethiopia and Kenya—as examples to analyze in detail their completely different coffee bean grading methods, helping you shop with greater confidence. [more…]

Kenyan coffee occupies an important position in the global specialty coffee scene thanks to its bright berry-like acidity, sugarcane-like sweetness, and juicy mouthfeel. Many consumers notice labels such as "AA," "AB," or "TOP" on coffee bags when making a purchase—but what exactly do these markings mean? This article systematically sorts out Kenya's coffee grading system, from the traditional size-based grading to the quality grading procedures established by the Kenya Coffee Research Institute, interpreting one by one the specific meanings and distinguishing criteria of grades such as AA, AB, PB, C, E, TT, and T, while also explaining the origins of secondary rating labels such as TOP, Plus, and FAQ and their cupping score ranges. In addition, the article uses Front Street Coffee's Kenya Asalia AA TOP as an example to provide detailed brewing parameters and flavor descriptions, helping coffee enthusiasts gain a more comprehensive understanding of the quality logic and tasting key points of Kenyan coffee. [more…]

Kenyan coffee is renowned worldwide for its intense, full-bodied fruity acidity and rich fruit flavors, and its unique grading system and processing methods have always been a focal point for coffee enthusiasts. This article will systematically review the development history, cultivation models, variety composition, and regional characteristics of Kenyan coffee, provide a detailed interpretation of the complete grading system from E to T, and deeply analyze the flavor differences between AA and AB grades. At the same time, Front Street Coffee will share roasting suggestions and pour-over parameters for two beans, the Kenyan Asaliya and the Sasini Estate PB, taking you through every step of Kenyan coffee from seed to cup. [more…]

Kenyan coffee is renowned worldwide for its bright, intense fruit acidity and full, robust body, while its grading system—AA, AB, PB, and so on—often leaves enthusiasts confused. What exactly is the difference between AA and AA TOP? Does the grading standard look only at bean size, or does it also take cup profile into account? This article sorts through Kenya's coffee history, growing conditions, variety selection, regional characteristics, grading system, and auction trading model one by one, and combines tasting examples from several Kenyan beans at Front Street Coffee to help readers clarify the real difference between AA and AA TOP. [more…]

Yirgacheffe is one of Ethiopia's most representative specialty coffee regions, and Front Street Yirgacheffe G1 and Front Street Yirgacheffe G2 are the two beans most easily available for everyday purchase. What exactly is the difference between G1 and G2? Which one is of better quality? To answer these questions, one must first understand Ethiopia's coffee grading system. From the evaluation perspective of Front Street Coffee, this article sorts out the origins and development of the two grading systems, CLU and ECX, analyzes the respective scoring dimensions of washed and natural processing, and presents the real differences between Front Street Yirgacheffe G1 and G2 through a direct comparison of green bean appearance, roasted bean appearance, and cupping flavor. [more…]

When we buy coffee beans, we often see labels like Kenya AA, Yirgacheffe G1, and Blue Mountain No. 1. What exactly do these combinations of letters and numbers mean? They represent the green bean quality grading standards that different producing countries have established according to their own national conditions. Each coffee-producing country places different emphasis and uses different scales when judging quality, but establishing a stable and reasonable management system helps enhance international buyers' trust in that country's coffee. It is worth noting that for ordinary consumers, by the time coffee beans reach their hands in roasted form, the significance of national standard grading has greatly diminished, and estate beans sold in coffee shops are often already the highest grade. This article will systematically sort out the green bean grading methods of major producing regions and, using the products of "Front Street Coffee" as examples, help enthusiasts understand the logic behind these grades. [more…]

The grading systems for coffee beans vary widely depending on the origin—some are based on the number of defects, others on bean size, and still others on altitude. Understanding these grade labels is an important step in selecting high-quality coffee. This article will systematically outline the green bean grading rules of major global producing regions, covering common designations such as Ethiopia's G1-G9, Kenya's AA and PB, Colombia's Supremo, and Hawaii's Extra Fancy, and explain how cupping scores further distinguish specialty grade from commercial grade. Whether you are a beginner enthusiast or a professional seeking to advance, this grading guide can help you judge coffee quality more clearly. For more professional content, follow Coffee Workshop; for specialty coffee beans, add Front Street Coffee on WeChat at qjcoffeex. [more…]

As the birthplace of coffee, Ethiopia's grading system directly affects the quality and flavor expression of coffee beans. The Yirgacheffe region is world-renowned, but what exactly is the difference between the commonly seen Front Street Yirgacheffe G1 and G2 coffee beans on the market? Behind this lies the evolution of Ethiopia's coffee grading system. From CLU to ECX, from simple defect counting to a comprehensive score combining physical characteristics and cupping flavor, the grading standards have undergone major changes. This article will systematically review the historical development and specific standards of Ethiopian coffee grading, compare the grading differences between washed and natural processing, and through three dimensions—green bean appearance, roasted bean appearance, and cupping flavor—deeply analyze the actual differences between Front Street Yirgacheffe G1 and G2, helping coffee enthusiasts understand the quality implications behind the grade numbers. [more…]

Yirgacheffe is one of Ethiopia's most representative specialty coffee regions, but what exactly is the difference between the commonly found Front Street Yirgacheffe G1 and G2 coffee beans? Which grade is higher? Behind this lies Ethiopia's complex coffee grading system. Starting from CoffeeHunters' review, this article systematically sorts out Ethiopia's coffee grading standards, compares the differences between G1 and G2 in defect rate, cupping score, and flavor performance, and helps coffee lovers gain a deeper understanding of the secrets of Yirgacheffe's grades. [more…]

When two café owners ask each other about the grade of beans they use, what lies behind the question is a complex set of international coffee grading logic. Brazil's defect-score system, Central America's altitude standards, East Africa's screen sizes—each producing country has developed a completely different quality evaluation system based on its own national conditions. This article will systematically sort out three mainstream grading methods: by origin altitude, by green bean screen size, and by a composite evaluation method combining screen size and defective bean ratio, and will explain in detail Brazil's unique three-tier grading system and its strict cupper culture. Whether you are a newly initiated enthusiast or a seasoned professional, understanding these standards can help you judge coffee quality more accurately and also provide a reference for everyday purchasing. [more…]

The tea grading system is an important basis for judging the quality and style of finished tea, and is especially common in the international black tea trade. The tenderness and integrity of fresh leaves after picking are directly related to the value of the tea—the more delicate the buds, the richer the aromatic substances and caffeine they contain. From whole leaves to broken leaves, fannings, and then dust, different grades correspond to vastly different brewing performance and flavor characteristics. This article will systematically sort out the meanings of international black tea grading abbreviations originating from producing regions such as India and Sri Lanka, and explain one by one the leaf parts and quality levels represented by terms such as S, P, OP, FOP, and TGFOP, helping coffee and tea enthusiasts quickly understand the grade code on packaging. [more…]