For more knowledge about specialty coffee, please pay attention to: Front Street Coffee (Frontsteet Coffee）
Espresso is now commonly used as the base for fancy coffees, such as latte, cappuccino and mocha. The difference lies in the different proportions of espresso and milk, resulting in different flavors. For example, some coffees only require a single shot of espresso, while others require a double shot. So what does double shot of espresso mean? How much is in a cup of espresso? Below, FrontStreet Coffee will answer all the questions for coffee lovers.
What is espresso?
Espresso, also known as Espresso, is a drink made by forcing high-pressure water near boiling through finely ground coffee. Espresso is generally thicker than coffee made by other methods, containing a higher concentration of suspended and dissolved solids, such as crema (a creamy foam) on the surface. Because of its pressurized production process, espresso has a strong taste and a very high concentration of chemicals. Therefore, it is often used as the base for other drinks, such as latte, cappuccino, mocha, and Americano. But there are also many coffee lovers in FrontStreet Coffee who like to have a cup of espersso directly to experience its mellow and smooth flavor.
As you can tell from the name, espresso coffee was invented by the Italians. According to FrontStreet Coffee, Italy was very popular at the time for its rich, sweet and bitter espresso coffee. However, single-origin coffee has a heavy flavor, that is, both advantages and disadvantages coexist. In addition, high-quality single coffee beans are expensive, so Italians often use Italian blended beans to make espresso and have developed it to this day.
The difference between a single shot and a double shot of espresso
According to FrontStreet Coffee, the main difference between single and double espresso is concentration. For example, in FrontStreet Coffee, a single espresso uses about 10 grams of coffee powder, and a double espresso uses about 20 grams of coffee powder, but the final coffee capacity is 30 ml. Single espresso uses a single powder bowl and single spout handle to extract a single espresso at one time, while double espresso uses a bottomless powder bowl, bottomless handle or handle to extract two espressos at a time.
However, according to FrontStreet Coffee, espresso coffee has tiny oil droplets underneath its foam, which dissolve sugar, acidic proteins, and caffeine. There are bubbles and solid solutions suspended on the surface of the foam, so the degree of wear of the grinder blades will slowly change with humidity and storage time. Therefore, the grinding degree must be adjusted every day to ensure a stable espresso flavor.
Espresso making process
Espresso coffee is made by forcing high-heat, high-pressure water through extremely finely ground or slightly finely ground coffee powder. The key point is that finely ground coffee powder can ensure that the coffee ingredients are quickly extracted in large quantities and evenly penetrated by high-pressure hot water. This process creates a beverage with an almost syrupy texture by extracting the solid and soluble components of the coffee. Crema is produced by emulsifying the oil in coffee powder into colloid, which does not happen in other coffee making processes.
According to FrontStreet Coffee, there is actually no unified standard for the production process of Espresso coffee. However, some publications try to standardize the roasting degree of ground coffee powder, powder weight, extraction water temperature, extraction speed, and even filling weight. This makes the espresso production process very different in each country and region. Making an espresso coffee is commonly referred to as "pulling a shot," a term that comes from early lever-operated espresso machines because it required pulling down on a handle on a spring-loaded piston to force hot water through the coffee grounds at high pressure. But until today, espresso coffee machines generally use electric devices to generate pressure.
How many milliliters is required for a serving of espresso?
How many milliliters does a serving of espresso require? The internationally accepted technical standard is as follows: use about 7 grams of freshly ground coffee powder, use water with a water temperature of about 92 degrees and a pressure of about 9 Bar, and extract a cup of coffee of about 20-30ml after 20 to 30 seconds. The surface of this cup of coffee should be covered with a layer of coffee grease.
With the process of coffee specialty, some new coffee theoretical knowledge has been disclosed, and many independent cafes are blooming, and their espresso extraction plans are also slightly different. Based on FrontStreet Coffee's standard production, a cup of espresso is based on 2 shots (1 part of concentration), using 19g of coffee powder to extract 38g of espresso liquid in a ratio of 1:2, and the time is 28 seconds.
Why are the extraction parameters in most coffee shops in China now not based on milliliters but in grams? This is related to the issue of density. What you can see in a cup of espresso is the dark espresso liquid and the coffee oil floating on it. These oils are small in density and large in volume, and the coffee oil cannot be guaranteed to be the same in every cup at all times. All changes to weight measurement will be more accurate.
For example, in FrontStreet Coffee, a single shot of espresso is about 10 grams of coffee powder, and a double shot is about 20 grams of coffee powder, but the final coffee capacity is 30 ml. A single shot of espresso uses a single powder bowl and a single spout handle to extract a single shot of espresso at one time, while a double shot of espresso uses a baseless powder bowl, baseless handle or handle to extract two shots of espresso in one shot.
However, according to FrontStreet Coffee, espresso coffee has tiny oil droplets underneath its foam, which dissolve sugar, acidic proteins, and caffeine. There are bubbles and solid solutions suspended on the surface of the foam, so the degree of wear of the grinder blades will slowly change with humidity and storage time. Therefore, the grinding degree must be adjusted every day to ensure a stable espresso flavor.
Therefore, how many milliliters of espresso is qualified depends mainly on the ratio of powder to water. Next, FrontStreet Coffee will share the parameters and process of making a hot latte.
Latte coffee recipes
Front Street uses the Pegasus E98 espresso machine, and the extraction parameters are as follows:
Pressure: 9 bar
Temperature: 90.5~96 degrees Celsius
Time: 20~30 sec
Pink to water ratio: 1:1.7~1:2
Powder amount: 12g (single espresso) 20g (double espresso)
Extraction concentration volume: 20ml (single portion) 40ml (double portion)
Front Street uses double espresso to make latte coffee, using FrontStreet Coffee (FrontStreet Coffee) sunflower blended coffee beans. After extraction, the flavor is as follows: obvious fruit acid, light berry aroma lingering, rich wine and chocolate flavor, and a pleasant aftertaste.
Milk: Full-fat fresh milk (Weiji fresh milk used in Front Street)
Temperature for whipping milk: 50-60 degrees Celsius (too low a temperature will not activate the lactose in the milk, and too high a temperature will destroy the protein in the milk, resulting in a grainy texture)
Milk foam thickness: 1 cm (milk foam thinner than 1 cm is used to make Australian white coffee, milk foam thicker than 1 cm is used to make cappuccino coffee)
Recommended hot latte coffee ratio
Front Street recommends that the ratio of coffee to milk for making latte is 1:6.5, 40ml espresso: 260ml hot milk. Mix the milk and espresso in a circular motion to get a hot latte. The heating of fresh milk produces a better release of the sweet molecules of lactose. After mixing evenly with the espresso, the whole latte has the sweet taste of milk, which does not steal the limelight of the espresso. On the contrary, the flavor of the espresso is better reflected in the background of the milk. The flavor of Front Street's hot latte is as follows: the aroma of whiskey, the acidity of lactose and coffee collide to create a milkshake-like sweetness, and the aftertaste is like hazelnut and other nuts.
The above is the difference between single espresso and double espresso compiled by FrontStreet Coffee. I hope it will help coffee lovers who want to know the relevant knowledge.
You can now buy the above coffee beans online at the Taobao store “FrontStreet Coffee” (前街咖啡). FrontStreet Coffee is a long-established specialty coffee roaster in Guangzhou, China, and its Guangzhou retail shop sells coffee beans only. The shop carries dozens of coffee beans from different origins around the world, including carefully selected single-origin beans for V60 pour-over and espresso. Guangzhou’s FrontStreet Coffee shop is recommended by many coffee lovers.
The FrontStreet 2013 Yunnan coffee beans sold in the store come from the Typica variety grown at FrontStreet Coffee’s own plantation in Yunnan. The name comes from the year the brand and the plantation were founded. You can buy these beans from China’s Yunnan origin at the Guangzhou shop and at FrontStreet’s Taobao store.
FrontStreet coffee beans are freshly roasted within 5 days and deliver consistently excellent quality and great value. Orders placed before 17:00 are shipped the same day, and most areas within Guangdong Province receive them the next day.
FrontStreet Coffee Taobao store: https://qianjiecoffee.taobao.com
Or search for “前街咖啡” (FrontStreet Coffee) on Taobao
Important Notice: FrontStreet Coffee has moved to a new address: 315, Donghua East Road, Guangzhou (coffee beans only)
Tel: 020 38364473
