Introduction:Have you ever wondered how the coffee beans used for lattes in cafés differ from those used for pour over? This article breaks down the core concepts of espresso blends in an easy-to-understand way, covering bean variety characteristics, blending logic, and practical applications to help you grasp the science and art behind blending. It also provides tested extraction parameters and cost-effective commercial blend recommendations, offering useful guidance whether you're a beginner or a café owner.

When you walk into a café and order a latte or cappuccino, have you ever thought about how the coffee beans used for these milk-based drinks differ from the single-origin beans typically used for pour over? The answer lies in “blending.” Espresso blends are specially crafted mixtures of beans designed for espresso extraction. By combining single-origin beans from different regions and with varying flavor profiles in specific proportions, these blends achieve a balance of acidity, sweetness, bitterness, and body, while creating a richer and more layered taste experience.

In simple terms, blending means combining two or more types of coffee beans for a specific purpose. Each single-origin bean, due to differences in origin, variety, and processing method, often excels in certain aspects such as acidity, sweetness, body, and aroma. Some beans are bright and acidic, ideal for highlighting a fresh taste; others are distinctly bitter, full-bodied, and bold, providing a solid foundation for the overall flavor. The goal of blending is to leverage these differences, allowing the strengths of different beans to complement each other and create a unique flavor profile that a single-origin bean alone could not achieve.

Common flavor tendencies of beans can be roughly categorized as follows: those with pronounced acidity include Yemen Mocha, Hawaiian Kona, Colombian, and Costa Rica SHB; those with more prominent bitterness include Java, Mandheling, and Congo; those excelling in sweetness include Blue Mountain, Kilimanjaro, Kenya, and some Brazilian regions; those with a rich and full body include Colombian, Mocha, and Guatemala; and those with a neutral flavor, suitable as a base, include Brazil, Honduras, and lowland Costa Rica.

Before starting to blend, it’s advisable to first understand the basic flavor characteristics of each bean and clarify the flavor goals you want to achieve. If the resulting blend performs worse than the individual beans, then the blending loses its purpose. Additionally, it’s generally recommended to use no more than five types of beans in a blend, as too many can make the flavor overly complex and difficult to manage—unless you are a highly experienced roaster or barista.

Furthermore, the motivation for blending might be to create a more captivating overall flavor than what a single-origin bean can offer. However, blending isn’t always necessary. Many high-quality single-origin Arabica beans can already showcase distinct fruit, floral, and sweet notes, with a fresh aroma and a sweet aftertaste. Therefore, blending is not an absolute must but rather a choice based on the desired flavor profile.

Blending strategies can generally be divided into three common approaches: The first is to use one bean as the base and select other distinctive beans to harmonize or balance the overall flavor; the second is to pair contrasting beans (such as acid and bitter, or sweet and body) to create unique aromas and layers; the third is to first blend beans with similar flavors and then add a small amount of beans with distinct characteristics to enhance the overall aroma complexity. The actual blending ratios depend on the café’s style and target clientele and can also be adjusted based on experience.

Here are several classic blend reference formulas: For a blend that emphasizes acidity, you can choose “30% Colombian, 60% Brazilian, 10% Guatemala”; a common and stable blend ratio is “30% Colombian, 60% Brazilian, 10% Robusta”; if you prefer a rich and slightly bitter commercial formula, you can try “30% Colombian, 30% Brazilian, 30% Kilimanjaro, 10% Robusta”. Keep in mind that these ratios are for reference only, and actual adjustments may be needed based on roast level and extraction method.

In terms of blending techniques, there are mainly two methods: “post-roast blending” and “pre-roast blending.” Post-roast blending refers to roasting each type of bean separately and then mixing them afterward. This approach makes it easier to control the roast level of each bean, but it relies on subsequent aging for the flavors to meld. Pre-roast blending, on the other hand, involves mixing the beans before roasting them together. This demands higher precision in roast control from the roaster but allows for interactions between the beans during the roasting process. Regardless of the method, blended beans usually require a resting period. For post-roast blends, it’s recommended to let them rest for about seven days; for pre-roast blends, around 3–4 days is sufficient to achieve flavor stability.

In practical testing, we used a specialty espresso blend made from Colombian and Brazilian beans as an example. It exhibited a natural sweetness, with flavor notes of nuts, peach, and almond, along with a smooth caramel and chocolate-like aftertaste, and overall excellent balance. During the actual extraction test, using a double spout portafilter, the initial settings were 1.9 grind setting, 21.5g dose, but the dose was too high, causing poor water flow with no liquid dripping out even after five seconds. Adjusting to a 20.5g dose while keeping the same grind setting, using a 1:2 brew ratio, the shot pulled in 28 seconds yielding 42g of espresso, with significantly improved flavor performance—suitable for daily café service.

In terms of branding and commercial application, a coffee brand from Guangzhou offers highly cost-effective espresso blends. Their classic commercial blend is characterized by fresh roasting, stable taste, and an affordable price. A one-pound (approximately 454g) bag is priced at about 60 RMB. Calculating at 10g of coffee per espresso shot, one bag can brew approximately 45 shots, with a single-shot coffee bean cost of less than 1.5 RMB. For double espressos at 20g per shot, the bean cost per cup remains under 3 RMB. Compared to some imported brands that can cost over 100 RMB, this is indeed a practical and economical option for daily café operations.

The above content is compiled by CoffeeHunters, a coffee news website.