The Differences Between Espresso and Black Coffee: Flavor Profiles and Characteristics Is Espresso Considered Black Coffee?

Black coffee, in simple terms, refers to unsweetened, un-milked coffee that presents as a dark liquid, with flavors representing the original characteristics of coffee beans. There are many types of black coffee, including pour-over coffee, siphon coffee, French press coffee, moka pot coffee, espresso made by espresso machines, and so on.

FrontStreet Coffee would like to clarify something: espresso belongs to black coffee, but Italian-style coffee does not necessarily belong to black coffee. For example, Italian-style coffees like latte and cappuccino, which are prepared with milk, belong to white coffee.

Authentic Espresso and Extraction Standards

Authentic espresso, following Italian coffee extraction standards, is a beverage of approximately 30ml made by forcing near-boiling hot water (about 92-94°C, at 9 bar atmospheric pressure) through finely ground, evenly tamped coffee grounds for 20-30 seconds of extraction time. The surface features a rich, dense layer of coffee oil foam called Crema. The color of this oil tends toward golden yellow and brown, though it may vary in shade depending on the roasting degree of the coffee. Due to its very intense flavor, many people add sugar or milk to balance the bitterness.

The Rich Texture and Science Behind Crema

The texture of espresso is the richest among all coffees and also has the highest concentration, generally between 9-11%, while pour-over coffee typically has a concentration of 1.2-1.4%. The rich texture of espresso is attributed to the abundant Crema oils. These oils are produced because coffee beans generate large amounts of carbon dioxide during the roasting process, which is rapidly released after the beans are ground. Espresso extraction requires high pressure to quickly extract the coffee's flavors. Under 9 bar pressure and sealed conditions, carbon dioxide and water reach a supersaturated state. Simultaneously, the coffee oils are emulsified and then encapsulate the carbon dioxide and coffee liquid as they are extracted together. Since oils are lighter than water, the extracted coffee gradually separates into layers, causing the golden oils to float on the surface, appearing very enticing.

Roast Degree's Impact on Crema

The degree of roasting also affects the richness of the crema. As the roast degree deepens, more carbon dioxide is produced. When coffee beans reach a dark roast, they experience significant dehydration and oil exudation. This also explains why when making SOE (Single Origin Espresso), lightly roasted coffee beans will always produce relatively thin crema regardless of the extraction method.

Espresso Flavor Profiles

The flavor of espresso depends on what type of coffee beans you use. Taking FrontStreet Coffee's espresso beans as an example, FrontStreet Coffee's premium Italian-style blend coffee beans use a 100% Arabica blend from Brazil and Colombia. The flavor is close to traditional Italian coffee, featuring rich nutty, chocolate, and caramel notes. If drinking espresso straight, you can also detect subtle fruit acidity.

Another blend is the Sunflower Warm Sunshine blend coffee bean currently used in FrontStreet Coffee's stores, which combines two single-origin beans: Honduras Sherry and Ethiopia Yirgacheffe Red Cherry. The flavors include very rich vanilla cream, sherry wine aroma, chocolate, and brown sugar.

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