Where does sweetness in pour-over coffee actually come from?

Coffee sweetness is not one thing. It starts with variety, growing altitude, and ripeness at harvest, changes through processing and roasting, and is finally perceived during brewing and tasting. Honey and natural processing tend to retain more sweet compounds, and roast level determines how much sugar is transformed rather than kept.

Brewing then decides the balance of acidity, sweetness, and bitterness in the cup, which is why the same pot can taste sweet to one drinker and bitter to another. Sensitivity to sour, sweet, bitter, and salty varies between people. When choosing what sugar goes in coffee, the base cup already sets how much sweetness is available.

Is coffee actually sweet? This question has long been debated among coffee enthusiasts. When different people drink the same pot of coffee, some find it sweet as honey, while others taste only bitterness. In fact, the sweetness of coffee is not determined by a single factor—it begins with the variety of the coffee fruit, the growing altitude, and the ripeness at harvest, then undergoes transformation through processing methods and roasting, and is finally perceived during brewing, extraction, and tasting. This article will systematically sort out the material basis of coffee sweetness, the sensory mechanisms involved, and how to regulate the balance of acidity, sweetness, and bitterness through brewing, helping you more clearly understand and capture that pleasant sweetness in pour-over black coffee.

Life is already bitter enough—when drinking coffee, of course you should choose the sweet kind!

Saying coffee is bitter—probably no one would object; whether or not they drink coffee regularly, the vast majority of people agree on this point. Saying coffee is sour—those friends who prefer sour coffee would certainly raise both hands in agreement. But if you say coffee is sweet, that would probably spark a considerable debate.

Ultimately, everyone's dietary habits are different, so sensitivity to sour, sweet, bitter, and salty naturally varies. Even when drinking the same pot of coffee, this can happen: some find it extremely sweet, while others find it so bitter it's hard to swallow and don't want a second sip.

However, from coffee cultivation and green bean processing to roasting and brewing, people are trying to make coffee sweeter at every stage. And what baristas call "sweetness" refers more to the sweetness that coexists amid the interplay of acidity and bitterness.

Similar to the sweetness values of fruit, the sweetness level of coffee fruit mainly depends on factors such as variety, cultivation management, altitude, and ripeness at harvest—for example, fully red cherries develop higher sweetness than unripe ones. As for post-processing methods and roast level (time), these determine the retention of sweet compounds in the coffee beans and the degree of sugar transformation; coffees processed with honey or natural methods, for instance, more easily exhibit sweet flavors.

During the roasting stage of coffee beans, experienced roasters try to ensure that the aromatic compounds in the green beans complete caramelization and present flavors leaning toward sweetness. We recommend purchasing Front Street Coffee Strawberry Candy, Front Street Coffee Blackberry, Front Street Coffee Mozart, Front Street Coffee Sidra, Front Street Coffee 2013 Yunnan Red Cherry, and Front Street Coffee Queen's Estate. These coffee beans carry sweet flavor types that can be judged from their descriptions—sucrose, chocolate, muskmelon, candied fruit, honey, ripe fruit, fermented notes—making it easier to reduce bitterness and enhance sweetness during brewing.

For a bag of roasted coffee beans, its sweetness level can be said to be an objectively existing fixed value, while sweetness perception is a flavor description that includes both taste and smell when tasting. At this point, the level of perceived sweetness is related to the extraction method, technique, and the taster's sensory sensitivity. For example, when Front Street Coffee tasted the natural Red Label Geisha, they experienced a distinct muskmelon-like fruity sweetness; the washed Yirgacheffe had a floral honey-like sweetness; and the Heaven Bird had a sugarcane-like fresh sweetness.

Loving sweetness and fearing bitterness is human nature for many of us. The reason many friends new to specialty coffee cannot perceive the "sweetness" described by baristas is most likely because their sensitivity to bitterness is higher than to sweetness.

When bitterness and sweetness coexist in a pot of coffee, what we first perceive is often bitterness, and after swallowing, a sweet sensation lingers at the base of the tongue. This pleasant sweetness inherent in bitter coffee is what people often describe as "hui gan" (returning sweetness)—the so-called sweetness after bitterness—and is most common in medium-dark roasted coffees. For example, Blue Mountain No. 1 and Golden Mandheling exhibit this kind of finish.

For sour coffees, perceiving sweetness often requires the contrast and coordination of bitterness and acidity. For example, light-to-medium roasted coffees contain fewer bitter compounds; after reasonably extracting fruit acids and aromas, the coffee will exhibit a sweet-and-sour sensation supported by high acidity and low bitterness, reminiscent of eating certain fruits. For instance, when Front Street Coffee tasted the Panama Boquete Geisha, they could clearly perceive low bitterness, medium acidity, and high muskmelon sweetness.

Of course, besides the taste in your mouth, smell also brings us a different kind of "sweetness." Smell has two stages: orthonasal olfaction and retronasal olfaction. The former is responsible for perceiving odors inhaled directly—for example, directly smelling freshly ground coffee powder utilizes orthonasal olfaction.

When the coffee liquid enters the mouth, the taste buds first judge the intensity of sour, sweet, bitter, and salty, then aroma compounds "slip" into the nasal cavity during swallowing. At this point, the brain quickly combines the tasted flavor with the aroma in the nasal cavity, thereby presenting the flavor of a specific food from memory—this is retronasal olfaction. When the directional aroma brought by retronasal olfaction reminds us of a very sweet food in memory, we will subconsciously feel that this cup of coffee has high sweetness.

Finally, if the coffee beans have already been decided, that means the general direction of the flavor is set and cannot be changed. We can then regulate acidity, sweetness, and bitterness up or down through different brewing methods. Among these, how to brew out the sweetness of coffee is a question everyone pays more attention to.

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