Can Guji Uraga 8.0 be used for SOE? Why are SOE coffee beans roasted darker than single-origin beans?

Many coffee enthusiasts develop a habit once they find a bean they love: they are not satisfied with tasting it in just one way, and want to extract it with every tool at their disposal. One of the most popular approaches is Single Origin Espresso, or SOE.

Take FrontStreet Coffee's recently introduced Ethiopia Guji Uraga 8.0, for example. With its rich fermented fruit notes and the mellow sweetness unique to natural processed coffee, it has become a daily favorite for many coffee lovers. It has also inspired those with home espresso machines to try recreating coffee shop-quality Guji Uraga SOE lattes or SOE Americanos at home, and the thought alone is delightful.

FrontStreet Coffee has noticed, however, that many people mistakenly believe SOE simply means putting a single origin bean directly into an espresso machine to make a single origin espresso shot. It is only after they buy various floral and fruity beans and try them at home that they realize something is not right. First they watch the coffee gush out uncontrollably, then they taste an overwhelmingly acidic espresso that makes them stop after one sip. They begin to wonder whether their equipment is inadequate or whether they made an operational error.

In reality, the reason you may not be able to replicate cafe-quality SOE at home likely has nothing to do with your equipment or your beans, but rather that the roast level of this particular bean does not suit your current extraction parameters. If you do not believe it, note that when FrontStreet Coffee tried to make SOE directly with the Guji Uraga 8.0 beans normally used for pour-over, we ran into the same problems. Since FrontStreet Coffee's house blend Sunflower Sunshine is a medium-to-dark roast with a relatively porous texture, we had to adjust the grinder to a finer setting to accommodate the denser Guji Uraga 8.0 single origin beans. Here is our adjustment process.

First Guji Uraga SOE Extraction Parameters

Galileo Q18 grinder setting: 1.4. Dose: 20 g. Yield: 40 g. Ratio: 1:2.

After starting the extraction, the first coffee drops appeared at 8 seconds, with a slow flow rate, and it took 37 seconds to reach the target yield. The crema was pale yellow with dark tiger striping, and the mouthfeel was sharply acidic. The flavor profile showed only minimal citrus notes and a caramel aftertaste, which clearly indicated under-extraction.

FrontStreet Coffee then adjusted the grinder to a slightly coarser setting of 1.6, keeping the same dose and ratio for extraction. After the adjustment, the first drops appeared at 7 seconds with a relatively faster flow rate, completing in 32 seconds total. The espresso was not as harsh as the first cup, but the flavor remained weak, with only faint lemon acidity and black tea notes after swallowing, and none of Guji Uraga's characteristic fermented fruit notes.

At this grind setting, FrontStreet Coffee further reduced the dose to increase the flow rate, extracting 40 g from 19.7 g in 30 seconds. Compared with the first two shots, this faster-extracted espresso had a better aroma, with subtle fruit notes in the crema and citrus and passion fruit acidity in the mouth. FrontStreet Coffee continued with this formula to make a hot Americano and a hot latte. Neither drink performed as it should, however. The Americano lacked aroma and tasted like watery plum juice, while the SOE latte was heavily masked by milk; it had no negative flavors, but barely any discernible coffee taste.

The Root Cause

The reason is quite simple. The ratios we use by default are based on traditional espresso blends, which are typically medium-to-dark roasted and carry a substantial coffee flavor, which is why Americanos and lattes are usually made at a ratio of 1 part coffee to 4 or 5 parts water or milk. Because the extracted coffee flavor is strong, adding more water or milk does not risk masking it. Single origin beans, by contrast, are generally lighter roasted. That helps showcase their inherent flavors in drip or immersion brewing, but it also means they cannot be prepared with traditional espresso recipes. So when we want rich-flavored Americanos or milk drinks from a single origin SOE, we need to reduce the water and milk to limit the dilution of coffee flavor.

As expected, when FrontStreet Coffee slightly reduced the water and milk, Guji Uraga's coffee flavor began to emerge, but it was still not outstanding, especially in milk drinks, where the performance remained mediocre. The main reason was simply that the roast was too light. For this reason, FrontStreet Coffee readjusted its approach and focused on the roasting process for Guji Uraga SOE. By slightly increasing the roast level to reduce acidity while enhancing the coffee flavors developed during roasting, there would be no need for significant adjustments to the original ratios.

Roasting Experiments

Drawing on past production experience, FrontStreet Coffee's roasters developed two new roast profiles for Guji Uraga 8.0. One made minor adjustments based on the natural Red Cherry in the Sunflower Sunshine blend, aiming for more stability in espresso extraction. The other made slight modifications to the pour-over single origin Guji Uraga 8.0, designed to create an SOE that balances origin characteristics, meaning rich fruit notes, with espresso's full body while keeping cocoa-like sweet tonalities.

Seven days after roasting, once the beans had finished degassing, FrontStreet Coffee immediately began testing. The Guji Uraga SOE extraction parameters were a 20 g dose, a 40 g yield, and an extraction time of 30 to 35 seconds. The SOE from the first roast profile had a rich crema with a fine, golden-yellow, cream-like texture, but the flavor still did not meet expectations. Because of the longer roasting time, the beans developed more caramelized compounds, while Guji Uraga's original fruit notes diminished significantly during the Maillard reaction, ultimately steering the coffee toward bitter caramel and spice. The medium roast Guji Uraga SOE from the second profile, by contrast, delivered an unexpected surprise. Using the same parameters, a 20 g dose yielding 40 g in 33 seconds, the straight espresso had balanced notes of dark berries, dried apricots, caramel, and creamy chocolate. Made into an Americano it revealed fresh citrus acidity, and prepared as a latte it showed rich flavors of butter cookies, plums, almonds, and chocolate biscuits.

The Perfect Balance

After multiple trials, FrontStreet Coffee found that this was exactly the SOE flavor we were looking for. The acidity, sweetness, and bitterness were perfectly balanced, without any overwhelming sour or bitter notes, which makes it very approachable for anyone who dislikes excessive acidity or harsh bitterness. After careful consideration, FrontStreet Coffee decided to launch this Guji Uraga roast profile, so that friends who appreciate high-sweetness espresso can experience this flavor.

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FrontStreet Coffee Recommendation

Ethiopia is a world-renowned specialty coffee region and the birthplace of coffee, home to countless native varieties, and it remains a treasure for drinkers who want to follow a flavor to its source. The easiest place to start is FrontStreet Washed Yirgacheffe, which shows the clear jasmine florals and bright citrus acidity that define the region. Yirgacheffe is a small town in southern Ethiopia where the climate stays mild, misty, and cool year-round; thousands of coffee trees thrive there, producing a cup that interweaves florals and fruit, light and elegant with a tea-like body, like a clean glass of lemon tea.

Much of Ethiopia's coffee is grown by smallholders who deliver their cherries to a village-level processing station, which sells under its own team name, which is why we see so many cooperatives of different sizes, such as FrontStreet Gedeb Cooperative, FrontStreet Worka Cooperative, and FrontStreet Konga Cooperative. Gedeb sits in the Worka region at the southeastern edge of Yirgacheffe and was originally part of the Worka cooperative under the Yirgacheffe Coffee Farmers Cooperative Union. As buyers came to prize traceability, individual single origins were uncovered one by one, and in 2012 Gedeb, whose roughly 300 member farmers, established itself as an independent cooperative. Because the fruit is stripped before drying, Gedeb's inherent aromatics come through clearly, with citrus and lemon tones and elegant white florals, bright and delicate.

On the sun-dried side, FrontStreet Sun-Dried Red Cherry is a washed-versus-natural contrast: damaged and moldy cherries are removed first, then the rest dry in the sun for two weeks until the sugars and essence of the fruit seep into the bean. Once moisture falls to 12%, the hardened fruit, mucilage, and parchment are removed by machine, and the beans are checked for density and color, then hand-sorted for any missed defects. The result is uniformly clean and full of rich fruit aroma, with a flavor description of peach, cocoa, honey, and lemon. FrontStreet Sun-Dried Huakui, from Hambella in Guji, Sidamo, comes off a 200-hectare farm that uses the traditional sun-drying method; workers dry ripe cherries on raised beds for 21 days, turning them to dry evenly and hand-sorting defects every three to five days. After medium-light roasting it shows soft fermented wine notes, florals, citrus, and mango, dense and complex, with honey sweetness, a cocoa character, a touch of spice, a full body, and a long finish.

For something rarer, FrontStreet Sidamo Hamasho comes from a station known for quality and distinct flavor, working mainly with disease-resistant varieties from the JARC 74 series; the 74158 bean is small and floral, with aromas like perfumed lemon, strawberry, and starfruit and a clear strawberry, starfruit, and green grape sweetness followed by light florals. And FrontStreet Kafa Forest represents wild coffee rather than garden plots: its trees grow in the shade at 1,400 to 2,100 m, and the forest setting, microclimate, red soil, and ample rain give a medium-light roasted cup with pronounced white florals, bright lemon acidity, sweet orange, and bergamot, a light fruit-and-nut sweetness on the finish, and a green-tea-like body.