Introduction:Yirgacheffe Kochere is one of Ethiopia’s most representative high-altitude washed coffee regions, where its Grade 1 (G1) and Grade 2 (G2) beans often puzzle coffee enthusiasts. This article provides an in-depth comparison of the two under the ECX grading system, covering defect rates, green bean appearance, roasting performance, and pour over flavor profiles. It also offers detailed roasting curves and pour over parameters to help you master everything from bean selection to brewing, thereby elevating your tasting experience.
The Yirgacheffe region in Ethiopia has long been globally renowned for its distinctive floral and fruity notes and bright acidity, with Kochere being one of the micro-regions that has garnered significant attention in recent years. Situated at an altitude of approximately 1,650 to 1,800 meters above sea level, the coffee in this area is mostly cultivated using traditional methods without the use of chemical agents, offering both natural and refined flavor potential. Among them, the washed G1 and G2 grade beans, although both originating from Kochere, exhibit noticeable differences in market positioning and actual drinking performance.
The Ethiopian Commodity Exchange (ECX) classifies washed beans into nine grades from G1 to G9 based on defect rates and cupping performance. Among these, G1 and G2 are considered high-quality commercial beans or even entry-level specialty options. Simply put, G1 allows no more than 3 defective beans per 300 grams of green beans, while G2 permits 4 to 12, which directly affects the uniformity of the bean appearance and the purity of the final flavor.
In terms of green bean appearance, G1 beans are typically more consistent in size, plump, and noticeably cleaner in terms of defects, whereas G2 beans show more variation in shape, often mixed with broken or underripe beans. These physical differences not only impact the evenness of heat absorption during roasting but also further influence the clarity and layering of flavors during extraction.
Regarding roasting, the two Kochere washed beans compared in this article are both processed via the washed method, which removes the pulp and undergoes fermentation washing to highlight the beans’ inherent acidity and aroma. For one brand’s washed Yirgacheffe G1, the charge temperature was set at 200°C, the turning point (yellowing stage) occurred at 5 minutes and 20 seconds, the first crack started at 8 minutes and 25 seconds when the drum temperature was around 185.4°C, and the beans were dropped after maintaining the first crack development phase for about 2 minutes, reaching a final temperature of 193.5°C. The bean color value was 65.5, the roast tone value 76.3, and the Roast Delta 10.8. Overall, the development was balanced, with the bean surface beginning to show oil but not excessively.
In comparison, the roasting curve for one brand’s washed Yirgacheffe G2 was slightly delayed. The charge temperature was also 200°C, but the yellowing time extended to 5 minutes and 35 seconds, the first crack began at 9 minutes and 08 seconds with a drum temperature of about 182.1°C, and the final drop temperature was 195°C. The bean color value was 66.9, the roast tone value 77.5, and the Roast Delta 10.6. It can be seen that G2 had a slightly higher first crack start and drop temperature, which may have affected the subtlety of the aroma and the speed at which the flavors were expressed.
In terms of cupping performance, G1 exhibited a richer layering: jasmine, ginger flower, lemon, grapefruit, plum, and Tieguanyin tea notes intermingled, with bright acidity and a fruity finish. The overall profile was refreshing with a long-lasting aftertaste. G2, on the other hand, was relatively simpler, dominated by jasmine, lemon, citrus, and a light tea note. Although it also had clear fruity tones, the overall layering was thinner, occasionally accompanied by some off-flavors, and its purity was slightly inferior to that of G1.
Translating to actual pour over performance, it is recommended to use a water temperature of around 91°C and a grind size of 58% passing through a Chinese standard No. 20 sieve (roughly equivalent to BG 5R), with a 1:15 powder-to-water ratio. The pour over method recommends a staged extraction: start with a 30-second bloom using 35 grams of water, then slowly pour to 130 grams with a small stream and pause briefly. When the water level drops and begins to expose the coffee bed, continue pouring to 225 grams before cutting off the water, and finally remove the filter just before the last drops fall.
Actual pour over results showed that G1 excelled in aroma, initially presenting distinct jasmine and lemon freshness, accompanied by a soft caramel sweetness. On the palate, the citrus acidity was soft and smooth, paired with a creamy mouthfeel. The mid-palate saw the return of lemon acidity, and the finish carried sugarcane sweetness with an oolong tea-like aftertaste. Overall, it was clean and layered. G2 opened with jasmine and citrus acidity, with the dominant flavors being lemon and grapefruit acidity along with a light black tea note. The finish brought some cocoa and caramel sweetness. While the flavor direction was clear, the overall clarity was slightly lower, occasionally accompanied by a sense of impurity.
In summary, although Yirgacheffe Kochere G1 and G2 both belong to high-altitude washed beans and share similar flavor profiles—primarily centered around citrus, jasmine, and fruitiness—their actual performances differ. G1, with its low defect rate, uniform bean appearance, and the rich aroma and distinct layers revealed after roasting and pour over, is better suited for coffee enthusiasts seeking refined flavors. G2, on the other hand, is more affordable and easier to access, making it ideal for daily drinking or for those just beginning to explore the flavors of Yirgacheffe. Regardless of which grade you choose, mastering the appropriate roasting curve and pour over parameters is key to enhancing flavor performance.
The above content is compiled by CoffeeHunters, a coffee news website.
