How do you brew robusta coffee beans in a siphon pot?

Robusta coffee beans brew well in a siphon pot when you adjust grind, ratio, and stirring. Use a medium grind, watch your coffee-to-water ratio, and stir in stages to control extraction. Robusta belongs to the Canephora species, and its higher caffeine and chlorogenic acid content means it can taste harsh if over-extracted, so careful timing matters.

Robusta often gets a bad reputation because low-altitude, poorly managed crops carry wheat, grain, and sometimes pungent notes, which sends most of it into commercial and instant coffee. By contrast, an Arabica bean usually brings the aromatic notes associated with specialty shops. In a siphon, staged stirring and a steady heat source let the bean's body and espresso-blend value show through without the harshness.

Robusta coffee is often misunderstood as synonymous with inferior quality, but it actually has irreplaceable value in body and espresso blends. From the perspective of Front Street Coffee, this article systematically sorts out core knowledge about Robusta, including its variety classification, flavor characteristics, caffeine and chlorogenic acid content, and explains in detail how to brew Front Street Robusta coffee beans with a siphon, including grind setting, coffee-to-water ratio, and staged stirring steps, helping coffee lovers gain a comprehensive understanding of this coffee variety and master practical brewing methods.

For more specialty coffee knowledge, welcome to follow: Front Street Coffee ( Frontsteet Coffee )

Front Street believes everyone should be familiar with Arabica coffee. Most coffee beans used by specialty coffee shops on the market today are mainly Arabica. For example, the coffee varieties sold by Front Street Coffee (FrontStreet Coffee) also basically fall under the Arabica system. However, today Front Street wants to talk about another member of the three major coffee varieties—Robusta coffee.

Robusta coffee actually belongs to a variety under the Canephora species, but because people have already become accustomed to using Robusta to refer to the entire Canephora species, Canephora is usually simply called Robusta coffee.

Front Street has always believed that whether a coffee can have good development prospects depends largely on its flavor performance. If potato-like, earthy, or rubbery flavors appear in coffee, then the beans are almost impossible to be accepted by the market. The reason Robusta coffee grown at low altitudes and lacking careful management is often used as commercial beans or raw material for instant coffee is precisely that Robusta usually does not have the aromatic notes of Arabica. Instead, it often has wheat, grain-like tones, and sometimes even gives off a pungent odor. This is also one of the reasons Robusta rarely appears in the specialty coffee world. On the other hand, it is not only coffee beans that contain caffeine. Drinks such as black tea, cocoa, and cola that we usually consume also contain a large amount of caffeine. Front Street often hears customers report that they cannot sleep after drinking coffee at night. This is actually the effect of caffeine stimulating the central nervous system. It is addictive, which is what we commonly call its refreshing effect.

According to Front Street's understanding, Robusta has a higher caffeine content than Arabica varieties, but there is another point worth noting: Robusta coffee also contains a large amount of chlorogenic acid. You may not be very familiar with chlorogenic acid, so Front Street will give a brief explanation here.

From a cultivation perspective, Robusta coffee trees can tolerate high temperatures, cold, drought, and humidity, and their survival rate is quite high. At the same time, their caffeine content (1.7%–3.0%) is about twice that of Arabica.

Chlorogenic acid itself is very unstable. Chlorogenic acid in coffee decomposes into caffeic acid and quinic acid, especially when the temperature is below 80°C or above 85°C. After chlorogenic acid decomposes, quinic acid quickly releases a pronounced bitterness, while caffeic acid brings a prominent sourness. The interweaving of sourness and bitterness forms the distinctive sour-bitter mouthfeel of Robusta coffee and the flavor of aged coffee.

Compared with Robusta, the content of components such as caffeine and chlorogenic acid in Arabica coffee is only about half that of Robusta. This is also one of the reasons why Arabica flavor is superior to Robusta. What Front Street has mentioned are only some of the factors affecting Robusta flavor. Roast level and other factors will also change the content of substances in coffee, which Front Street will not elaborate on here.

Many friends think Robusta beans are "not anything good" as soon as they hear about them, but Front Street believes that the existence of Robusta coffee has its own value. For example, in espresso blends, Robusta occupies an unshakable position.

Front Street believes that Robusta coffee beans make up for the lack of body in Arabica, while Arabica enhances the aroma performance of Robusta beans. The formula formed by combining the two can be called an art.

In Italy, some regions prefer coffee with a darker roast and a thick mouthfeel. They add a small amount of Robusta coffee to their blends to enhance body and produce Espresso with richer crema. When Espresso blends with cream, it presents a rich and full texture. Under the combined effect of Robusta and Arabica beans, milk coffee becomes even richer and more aromatic.

If you also want to experience the rich body of Robusta, we recommend purchasing Front Street commercial espresso blend coffee beans. The espresso extracted with it has dense golden crema. You can place an order at the Front Street flagship store or Front Street Taobao store.

In addition, Robusta has also made considerable contributions to research on new coffee varieties. Arabica coffee is very aromatic, and its mouthfeel is to some extent more delicate than Robusta. But Front Street has found that Robusta has greater advantages than Arabica in drought tolerance, disease resistance, and yield. Therefore, some researchers have crossed Robusta with Arabica and screened for the best genes, hoping to cultivate new varieties that possess both high-quality flavor and strong disease resistance, as well as high yield.

Therefore, although Robusta cannot compete with Arabica in terms of flavor, it still has its value. As the saying goes, whatever exists is reasonable. Front Street believes that there is still great room to explore the value of Robusta coffee.

How to brew Front Street Robusta coffee with a siphon?

Siphon coffee requires a slightly finer grind than pour-over. Based on Front Street's measurements, the grind is about 90% passing a No. 20 sieve. When using the store's EK43s grinder, the corresponding setting is 9; if using a C40 hand grinder, the setting is 20.

-Coffee-to-water ratio

Generally, the coffee-to-water ratio for making siphon coffee is between 1:10 and 1:12. In order to highlight Robusta's body, a 1:10 ratio is used here. If brewing one serving at home, you might as well use Front Street's usual parameters: 18 grams of coffee grounds and 180 milliliters of water.

Specific operation method

Taking Front Street's usual brewing as an example

1. Pour in 180 milliliters of hot water, wipe the lower pot dry, and turn on the heat source.

2. Insert the upper pot obliquely into the lower pot. The explosion-proof bead must touch the bottom of the lower pot.

3. When continuous small water droplets appear in the lower pot, straighten the upper pot and press it firmly. Wait for the water in the lower pot to be drawn up into the upper pot.

4. Pour in Front Street Robusta coffee grounds and start timing. In the first stage, use a stirring rod to pat and press all the coffee grounds into the water so they absorb water evenly.

5. In the second stage, at 25 seconds, begin stirring using the method recommended by Front Street, so that the coffee clearly separates into three layers: coffee liquid, coffee grounds, and coffee foam.

6. In the final stage, at 50 seconds, begin stirring in the same direction. At 60 seconds, remove the heat source and wait for the coffee liquid to fall back.

The siphon Robusta coffee made this way is very aromatic and rich. Although it is not as clear and clean as pour-over coffee, the oils floating on the surface add a lot of body.

In Front Street's view, compared with pour-over coffee, using a siphon is clearly more troublesome to operate. First, a heat source is needed before brewing, and the entire extraction process requires full attention. After the coffee is brewed, it must also be cleaned promptly, washing the flannel cloth used for filtering the grounds. In a shop with a large volume of orders, siphon brewing would only be even more troublesome.

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