Flavor Differences Between Bock Latte and Regular Latte How to Make Bock Milk

Introduction to Eisbock Milk Coffee

Recently, coffee shops of various sizes have introduced Eisbock milk coffee, largely due to the launch of "Eisbock" refrigerated refined milk by Bihu. However, before this product appeared, some coffee shops had already featured Eisbock milk coffee as their signature product. So how did they make their Eisbock?

What is Eisbock?

Eisbock is transliterated from the German word "Eisbock," which originally refers to the freeze distillation process for purifying beer, also known as German ice beer. Its principle is to release different substances based on their varying freezing points. Applying the same principle to milk creates what we call Eisbock milk.

For example, in milk, water freezes at 0°C, while other substances (protein, fat) have lower freezing points than water. If milk is placed in a -20°C environment, the water in the milk will first freeze into ice. Only when the temperature reaches the freezing points of other substances will they gradually freeze completely. During the melting process, other substances melt and release more easily, while ice melts the slowest. By utilizing the different freezing points of substances in milk, we can achieve water-milk separation, obtaining more concentrated milk—this is Eisbock milk.

How to Simply Make Eisbock Milk?

FrontStreet Coffee stores do not offer Eisbock coffee, but here we'll demonstrate how to make Eisbock at home. The materials needed are simple: just a carton of milk and a container to hold the Eisbock.

① First, place the entire carton of milk in the freezer compartment. FrontStreet Coffee uses 946ml cartons of Kowloon Dairy fresh milk, placed in the freezer for 12 hours until the milk freezes into an ice block. The frozen milk carton will be quite swollen, and pressing firmly will reveal that it's very hard, which can confirm whether it has completely solidified.

② Remove the milk from the freezer, open a small opening in the milk carton as you normally would, place the milk carton upside down above the container, then use clean plastic wrap (a plastic bag) to seal both the milk carton and the glass container, and secure with tape. The benefits of doing this are twofold: first, it stabilizes the structure to prevent collapse, and second, it blocks external contamination, especially moisture from the air. By sealing with plastic wrap, we prevent water vapor from the air from condensing into droplets and falling into the container.

③ Just let it melt at room temperature. The milk will drip into the container drop by drop, typically releasing 40%-60% of its original volume (if you prefer a richer milky aroma, you can release only 40%; for normal results, choose 50%; if you're concerned about wasting milk, choose 60%). After a long 4 hours, 450ml of Eisbock milk was finally released. This way, we used a 946ml carton of fresh milk to make 450ml of Eisbock.

What Does Eisbock Milk Taste Like?

The high-purity milk produced by Eisbock has a stronger milk aroma and appears to have more body. Through tasting, FrontStreet Coffee found that the milk has a very high sweetness and is quite mellow. After drinking Eisbock milk and then drinking regular fresh milk, the fresh milk tastes as light as water. However, Eisbock milk can also feel overly sweet and heavy when drinking a large glass due to its concentration.

Therefore, Eisbock milk paired with espresso is the perfect combination, such as the popular Eisbock Dirty in coffee shops.

The taste of Dirty mainly depends on the espresso beans used. FrontStreet Coffee stores use their own roasted "Sunflower Warm Sunshine Blend," which is composed of 70% Honduras Sherry coffee and 30% Yirgacheffe natural red cherry coffee. The whiskey, vanilla, and cream flavors of the Sherry combined with the tropical fruits and fermentation notes of the red cherry create a rich aroma and smooth mouthfeel in the cup. The first sip of Eisbock Dirty coffee reveals a rich coffee aroma with notes of whiskey, vanilla, and berries. From the second sip onward, as the cold milk blends in, you can experience a cocoa and cream-like texture. After drinking, the mouth retains the sweet fragrance of strong coffee and milk, with very rich layers.

For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat public account: cafe_style)

For more specialty coffee beans, please add FrontStreet Coffee's private WeChat account: qjcoffeex

Important Notice :

前街咖啡 FrontStreet Coffee has moved to new addredd:

FrontStreet Coffee Address: 315,Donghua East Road,GuangZhou

Tel:020 38364473