On a weekend morning, standing in front of the home coffee machine, full of anticipation as you press the button, the coffee in the cup is sometimes so thick it cannot be dissolved, and sometimes as bland as water. Actually, the coffee machine is like a chef who is very particular about heat control; whether the taste presented in the cup is smooth or not largely depends on the delicate balance between concentration and extraction yield. As long as you understand the tacit understanding between the two, the home coffee machine can steadily produce the good flavor you want.

We can imagine extraction as dissolving fruit candy in warm water. Concentration refers to how much coffee substance has actually dissolved into this cup of water, determining whether the mouthfeel is rich and full or clear and light; while extraction yield is the proportion of flavor brought out from the coffee grounds, determining whether what you taste is bright sweet acidity or burnt bitter miscellaneous flavors. Only when the two work together in harmony will the coffee have both the proper body and full aroma.

If the espresso on hand tastes sour and somewhat weak, it is usually because the grind is too coarse, causing under-extraction; adjusting the grinder one step finer can make the flavor fuller. If the first sip feels dry and astringent and the burnt bitterness lingers for a long time, it is mostly over-extraction caused by too fine a grind or too high a water temperature. At this point, slightly adjusting the grind coarser, or slightly lowering the brewing water temperature, will naturally bring back that smooth and balanced sweetness.

When fine-tuning parameters at home in daily life, you can establish a reliable baseline coordinate. Fill the home double basket with 18 to 19 g of coffee grounds, distribute the grounds evenly and tamp them firm, then start brewing and observe the flow rate, aiming to extract 36 to 38 g of espresso within 25 to 28 seconds. Taste the flavor within this framework, then make slight increases or decreases in the grind setting according to the feel on your tongue, and you can steadily grasp a smooth and pleasant state.

Once you have learned to adjust parameters, when choosing beans you need to consider whether this bag of beans is suitable for drinking strong or light. Friends who like adding a large amount of milk to make a hot latte or a layered Dirty need a rich and deep base. Qianjie Specialty Blend Coffee is composed of Colombian and Brazilian semi-washed coffee beans; Colombia brings rich dark chocolate and caramel flavors, and after adding milk it is sweet, fragrant, and smooth, with latte art shapes being especially stable.

If you want to make both a rich milky coffee and, once in a while, add water to make a highly balanced everyday Americano, Qianjie Black Cocoa Coffee is a very approachable choice. It cleverly blends the soft slight acidity of Yunnan small-bean coffee with the nutty aroma of Brazilian coffee, using a medium-dark roast to give it a steady character. Made into an Americano with water, you can taste creamy peanut and soft plum acidity; made into a latte, it presents a warm, gentle, and balanced mouthfeel.

If you prefer drinking light and are used to making a refreshing juice-like Americano, then a medium-roast specialty blend is suitable. Qianjie Strawberry Candy Espresso Italian-style Blend brings together single-origin beans from Colombia, Ethiopia, and Costa Rica; the extracted espresso, when mixed with ice water, offers stunning aromas of rose, grape, dried blueberry, orange, and fruit gummy candy, light with no bitterness.

If you want to try the pure charm of a single-origin SOE, Qianjie Queen's Estate Coffee is well worth putting in the bean hopper. This high-altitude Yellow Bourbon variety, through medium-deep roasting, produces espresso that gives off aromas of roasted nuts, milk chocolate, and buttery caramel. Whether sipped directly in small mouthfuls as SOE or made into a smooth Flat White, the body and sweetness both come across as especially comfortable.

Making coffee at home is actually a flavor exploration. Once you understand the extraction rhythm of the coffee machine, and then choose beans according to whether you want to drink strong or light, cafe-level aroma can be within easy reach. Listening to the coffee liquid slowly dripping, smelling the nuts and fruity sweetness filling the room, the pace of daily life also slows down within this cup of rich aroma adjusted by your own hands.