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Dirty Coffee, with its rather playful name, is a unique coffee style. Visually, the coffee looks as if it has sullied the white fresh milk, and the fusion of hot and cold brings a unique layered mouthfeel. Of course, it is also a best-selling coffee at Front Street stores. Many friends who love to "experiment" are always challenging themselves with all kinds of coffee at home, and Dirty is a very popular one, so today let's get into the learning session.

What is Dirty?

Put simply, Dirty coffee is a good-looking iced latte with a special way of drinking it, and it is loved by many people because of its high aesthetic appeal. Some friends have also followed tutorials to make Dirty coffee, but the Dirty coffee they made did not have the expected layering, and instead mixed together with the milk. What is going on here? Front Street has summarized several common reasons.

1. Choice of coffee beans

Since Dirty mainly emphasizes preserving the crema of the espresso and the visual effect of layered gradation, when choosing coffee beans, you cannot use a type with too light a roast level, as this will make the Dirty look very thin. In order to let the espresso release rich golden crema and give the Dirty a mellow mouthfeel, Front Street's classic Italian-style blend coffee beans are recommended. This is a dark-roasted coffee made from a combination of Brazil semi-washed, Indonesian Mandheling, and Vietnam washed, with a toasty aroma and, more importantly, full-bodied crema.

2. Choice of cup

The shape of the cup is also an important factor in forming the layers. Generally, choosing a cup with a tall body and a small opening makes it easier to form a layered effect. If you choose a cup with a wide mouth and a relatively short body, then the time needed for the coffee to spread across the entire liquid surface will be longer, and there will not be enough distance for the coffee liquid to "dirty" downward, making it less aesthetically pleasing.

It is best if the cup has been frozen beforehand, as this can both slow down the speed at which the coffee liquid permeates downward and maintain the flavor and mouthfeel.

3. Distance for receiving the coffee liquid

The most common problem is that the distance between the extraction handle and the cup is too long. In this way, during the espresso extraction process, the coffee gathers into a thin, long stream, creating a relatively large impact force that pierces through the surface of the milk, making it difficult for it to float on the surface and form layers. Therefore, if you want to form attractive layers, you need to keep it close to the extraction handle; the closer to the liquid surface, the better the effect.

If, due to the limitations of the machine, you cannot directly receive the extracted coffee liquid, you can first put the freshly extracted espresso into a small cup, then use a small spoon held just above the surface of the milk to form a buffer layer. Note that you must keep the concave side of the spoon facing up and slowly pour the coffee liquid into the spoon; the coffee liquid overflowing from the spoon will float on the surface of the milk.

4. The coffee liquid is not concentrated enough

Many friends ask Front Street whether a moka pot can achieve the same effect as an espresso machine. Unfortunately, the coffee liquid brewed by a moka pot still has a big gap in concentration compared with a coffee machine, let alone in terms of crema. Therefore, coffee brewed by a moka pot is not suitable as the coffee base for Dirty.

It is generally believed that espresso with rich and fine crema produces a better layered effect when made into Dirty coffee, as the coffee liquid permeates into the milk more slowly, allowing ample time for photos.

5. The milk is too thin

You can choose milk that is a bit richer and has a stronger milky aroma. Milk that is too thin cannot support the coffee liquid, causing the two to merge together as soon as they come into contact. Not only does it look murky visually, but it also lacks the rich mouthfeel you get when drinking it in a café.

Taking Front Street's product experience as an example, several common milk brands on the market, such as Vitasoy, Weichuan, and Bright Fresh Pasture, are all good choices. Of course, if you have time, you can also make your own purified milk as a base, namely the "Ice Blog" that often appears in cafés. Front Street has also published a detailed article explaining the production steps. Dirty made with purified milk is more likely to form a stable layer, lasts longer for drinking, and also has the unique taste of salty cheese.

Of course, some friends also use the method of "Ice Blog + fresh milk" to create milk with a moderate concentration, which is also a good attempt.

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