When making a Dirty, the strong hot coffee liquid falls directly into the ice-cold milk. When drinking, swallowing in large mouthfuls lets you experience the distinct layering of warm oils and cold creamy fragrance. This distinctive drink, which blends hot and cold without being stirred, sends the espresso into the mouth in a short time, so when choosing beans, the release intensity of caffeine and how friendly it is to the stomach and intestines need even more to be taken as important references.

Caffeine content is often closely related to the coffee tree species. The caffeine proportion of high-quality Arabica beans itself is usually maintained between 1.1 percent and 1.5 percent, clearly lower than that of Robusta. When choosing beans for a Dirty, using 100 percent Arabica single-origin beans can keep the caffeine load of the entire drink in a mild range. A light to medium roast style can also preserve the plant's natural floral, fruity acidity and sweetness, making it feel refreshing and burden-free to drink.

Around ten in the morning is when the body's cortisol gradually declines, and enjoying a Dirty at this time can bring a smooth awakening experience. After the morning meal as a foundation, the stomach is in a full state, and the coating of high-quality cold milk can further buffer the stimulation brought by espresso. At this time, it is suitable to choose beans with bright acidity and a light aroma, letting the fresh fruity notes accompany the milky sweetness to awaken your working state.

At this time of day, it is very suitable to use Qianjie Yirgacheffe Gudingding to make it. This bean produced in Ethiopia has a clear citrus peel aroma and red berry sweetness, and can form a refreshing complement with the lactose of ice milk. When extracting with an espresso machine, set the water temperature to 92°C, grind and tamp 18g of coffee powder, and through constant-pressure extraction obtain 36g of espresso liquid within 26 seconds, then steadily pour it onto the surface of ice milk. On the palate, you can feel a gentle aftertaste like green tea and a comfortable floral fragrance.

After drinking a milk-fat-rich Dirty in large mouthfuls, the body needs an appropriate amount of water to promote metabolism. Within half an hour after tasting, slowly drinking two hundred milliliters of warm plain boiled water can keep the mouth refreshed and reduce the body's burden. In the morning, if paired with foods rich in fiber and protein such as whole-wheat European bread, roasted nuts, or soft-boiled eggs, it can also delay the peak absorption of caffeine, allowing energy release to remain steady and lasting throughout the whole morning.

By two in the afternoon, the laziness brought by lunch digestion begins to appear. At this moment, a Dirty needs fuller sweetness and berry flavors to light up the senses. At this time, it is suitable to choose beans that have undergone fermentation processing and are rich in juice-like character, using the intense fruity aroma to stimulate appetite and spirit. This not only satisfies the taste buds but also avoids needing to drink excessively to obtain alertness.

For a midday pick-me-up, you can choose Qianjie Colombia Sidra. This bean shows a rich interweaving of passion fruit, ripe blueberry, and apricot. In the espresso extraction operation, set the water temperature to 93°C, use 18.5g of finely ground coffee puck, and after low-pressure pre-infusion, extract at constant pressure for 27 seconds to produce 37g of aromatic espresso liquid that drips directly into refrigerated milk. The intense fruity aroma combines with the icy rich milk, just like a cup of tropical fruit milk with balanced acidity and sweetness, making one feel refreshed.

Near evening or after four in the afternoon, the body's metabolism time for caffeine becomes shorter. In order to avoid affecting sleep quality at night, bean selection should place particular emphasis on delicate fragrance and low alcohol bitterness. Tasting a Dirty at this time point places more stress on refined aroma enjoyment. You can appropriately reduce the proportion of espresso in the whole cup, letting an elegant flavor like floral black tea take the leading role.

At this time, drinking Qianjie Panama Hacienda La Esmeralda Red Label Geisha is especially suitable. Its unique jasmine, bergamot, and high-mountain black tea aroma can bring a calm and relaxed mood. When extracting, set the water temperature to 91°C, use 19g of coffee powder, and through stable machine extraction for 28 seconds obtain 38g of espresso liquid. When this delicately aromatic espresso liquid glides over frozen purified milk, it shows a smooth touch like black tea au lait, and the elegant aftertaste lingers in the throat, soothing both body and mind.

A standard Dirty usually contains the extraction amount of a double espresso. For everyday drinkers, arranging one to two cups a day is enough to fully enjoy the pleasure brought by the flavor. Match suitable beans and milk temperature according to your own current physiological rhythm, and in the flow of sweet smoothness and bright aroma, let every sip fit a relaxed and comfortable healthy pace.