The charm of making a Dirty lies in that intense contrast when you take a big gulp. The warm, thick layer of espresso on top instantly collides with the ice-cold whole milk below, and the dramatic interplay of temperature and concentration directly awakens the senses. To make a cup of Dirty at home with distinct layers and a delicate mouthfeel, the flavor direction you choose when picking beans is especially key, as single-origin beans and blended beans each present completely different flavor personalities.

Taking the blend route to make a Dirty pursues a solid, balanced, fully enveloping base. Common high-quality blends on the market usually combine beans from different regions or processing methods, and through medium-dark roasting they take on rich caramel, nut and cocoa aromas. When this kind of espresso is poured over the surface of ice milk, it blends well with the creamy sweetness of the milk, delivering a smooth experience like melting chocolate.

Understanding the recipe ratios of a blend can help you quickly lock onto the flavor direction you want. If you see a large proportion of South American beans in the recipe description, such as over half being Brazilian or Colombian washed beans, it usually means this bean takes a steady route of low acidity, high body and abundant nut-and-chocolate aromas; if a small amount of African washed beans is skillfully added to the recipe, it often adds a touch of citrus-like soft fruitiness to the hefty base, enriching the layering on the palate.

Completely different from the steadiness of blended beans, single-origin beans, or what everyone often calls SOE, show a pure regional flavor personality when used to make a Dirty. When you press single-origin espresso with distinctive floral-fruity aromas or berry sweetness into ice milk, the otherwise ordinary ice milk is stirred into a fresh texture resembling a fruit milkshake. This lively flavor born from the collision of fruit acidity and milky sweetness is exactly why many coffee lovers are devoted to single-origin Dirty.

Friends who prefer juicy flavors and bright tonality might as well try Qianjie Kenya Small Tomato. This bean carries a full cherry tomato flavor, with the sweet-sour charm of smoked plum and a gentle brown sugar finish. When making a single-origin Dirty, use espresso extraction: take 18.5g of coffee grounds, extract at constant pressure within 26 seconds to get 37g of coffee liquid, pour it directly over the surface of ice milk, and a big gulp is like tasting an icy milk pudding with the sweet aroma of plum jam, vivid in its sweet-sour balance.

If you want to occasionally change things up and experience pour-over, this Kenyan bean also performs excellently. Weigh out 15g of coffee grounds, use 90°C water, and pour 225ml of hot water at a 1:15 ratio. Use a three-stage pouring method: first pour 30ml of water for a 30-second bloom, then steadily pour to 130ml, and after the water level drops, pour in the remaining water, keeping the total time to 2 minutes 05 seconds. The resulting cup of black coffee is crisp and refreshing, with a pleasant, transparent acidity.

If you lean more toward elegant floral-and-fruit tea aromas with a clean, sweet aftertaste, Qianjie Kafa Forest is another distinctive representative of single-origin flavor. It has a refreshing orange aroma, the soft fruit sweetness of ripe apricot, and a lingering oolong-tea-like note in the finish. Made into an SOE Dirty, the moment the warm espresso melts into the ice milk, the fruit aromas unfurl and spread along with the milky fragrance, leaving a clean, sweet fruit milk tea flavor on the tongue.

When making the espresso base for Kafa Forest, you can weigh out 19g of coffee grounds and extract 38g of espresso within 27 seconds through constant-pressure extraction on an espresso machine, allowing the delicate fruit aromas and tea notes to fully emerge. If you are used to using a moka pot at home, you can also add 90ml of hot water to the lower chamber, fill in an appropriate amount of coffee grounds, and heat over medium-low heat for 1 minute 50 seconds; pour the extracted cup of rich coffee liquid into ice milk, and you can likewise taste a clear apricot sweetness.

In choosing between a blend and a single origin, it mainly depends on what you expect from the drink at the moment. If you want to quickly get a cup of fragrant, thick, chocolate-sweet and consistently performing milk coffee in the morning, a classic blend brings a full sense of reassurance; if on a leisurely afternoon you want to feel the charm of a region's terroir and taste the novel texture of fruit acidity interwoven with milk fat, single-origin SOE brings a pleasantly surprising taste exploration.

Once you understand the balance of blends and the personality of single origins, choosing coffee beans suitable for making a Dirty becomes clear and natural. Whether you are enamored with a rich, solid nutty milk-candy aroma or devoted to a light, lively fruity tea milk aroma, as long as you pick the right flavor style and pair it with a suitable extraction method, you can whip up a layered Dirty that stuns the palate at home anytime.