On a weekend morning, grinding beans leisurely in the kitchen, you meant to enjoy a cup of aromatic hot coffee, but after drinking it you often find it either too strong and bitter, or noticeably watery and bland, and occasionally a drying, tightening astringency lingers at the back of your tongue. In fact, the beans are not the problem. It is usually the two invisible levers of extraction yield and strength quietly at work. Once you understand their little quirks, the flavors in your cup can immediately become smooth and pleasant.

Many people easily confuse strength with extraction yield. To use an everyday analogy, strength is like how much water is added to a bowl of chicken soup, determining whether the first sip is salty or mild, rich or thin, and this is mainly controlled by the coffee-to-water ratio. Extraction yield, on the other hand, is how much of the savory substances in the chicken has actually been cooked out, and it determines whether the soup has clear layers with balanced acidity and sweetness, or carries a scorched, miscellaneous bitterness.

Grind size and water temperature are the two core knobs that directly affect extraction yield. The finer the coffee beans are ground and the higher the brewing water temperature, the more fully the hot water contacts the coffee grounds, and the extraction yield will soar, and with the slightest carelessness it will bring out the astringency of the woody portion and a burnt bitterness. Conversely, if the grind is too coarse or the water temperature is too low, the aromatic substances do not have time to dissolve out, and the cup tastes sour and hollow, lacking sweetness for support.

To find the baseline, a very reliable reference recipe can be used for everyday pour-over. Prepare 15g of coffee grounds, use a 1:15 coffee-to-water ratio, and pour a total of 225ml of hot water. Pour in stages: first pour 30ml of water for a full 30-second bloom, then steadily pour in circles to complete the extraction. Keep the total brewing time at around 2 minutes. This can open up the flavors of beans from most origins.

After brewing this cup, fine-tuning becomes especially easy. If the whole cup tastes weak and watery, try tightening the coffee-to-water ratio to 1:14; if it feels too intense and suppresses the aroma, you can slightly increase the water; if there is obvious astringency in the finish, adjust the grinder setting half a step coarser, or lower the water temperature by two degrees. Through small adjustments to these few parameters, the same bag of beans can be tuned to a comfortable, smooth, sweet spot.

When choosing beans day to day, you should also consider whether they are naturally suited to being brewed strong or light. High-altitude beans such as those from Ethiopia, known for floral notes and fruity acidity, are naturally suited to being brewed clear, transparent, and elegant. For example, Qianjie Huakui coffee beans, with a natural-process light roast, bring a soft fragrance of strawberry, grapefruit, and orange blossom. If brewed too strong, it will instead cover the delicate floral and fruity aromas. Drink it with slightly higher water temperature and a light strength, and the whole mouth is filled with the refreshing pleasure of clear sweetness like fruit juice.

In the major producing regions of Central and South America, many beans inherently carry a rich nutty sweetness, and they can withstand high strength very well. For example, Qianjie Brazil Queen Estate coffee beans come from the rare Yellow Bourbon variety of Mogiana. The thick mucilage layer concentrates abundant sugars under natural processing, with classic peanut and cream aromas and a solid texture. Drink it slightly stronger, and that dense, smooth sweetness will wrap around the tongue like melted toffee.

If you prefer a deeper, mellow body, the representative of the Indonesian region, Qianjie PWN Golden Mandheling coffee beans, is a classic not to be missed. The strictly selected green beans are extremely clean in quality, bringing out rich herbal aromas and dark chocolate flavors. The body is very striking, and the finish also reveals a fascinating caramel syrup sweetness. Drunk slightly stronger, it becomes even deeper and fuller, and even with warm milk it still has a rich flavor.

Understanding the temperament of the coffee beans in your hands is actually a very enjoyable thing. Bright, elegant floral and fruity notes are suited to stretched-out, transparent extraction, while sweet, solid nutty and cocoa notes are suited to preserving a rich sweetness. Usually pay more attention to the subtle changes in grind, water temperature, and coffee-to-water ratio. No matter which producing region's coffee beans you open, you can calmly brew at home a full-mark good cup of coffee with the strength you like, smooth on the throat and sweet in the aftertaste.