In terms of espresso preparation, what is the 'heart' layer known for?

The 'heart' layer of espresso is recognized for contributing richness and body to the overall espresso shot. This layer is found beneath the crema and is primarily responsible for the deeper flavors and full-bodied mouthfeel you experience when sipping espresso.

When espresso is extracted, the different layers play distinct roles. The crema, which sits on top, offers aroma and a light texture, while the heart provides the substantial body and richness that many coffee enthusiasts appreciate in a well-prepared shot. The balance between these elements is essential for achieving a quality espresso.

While other layers or aspects of espresso preparation, such as aroma or temperature, might influence the overall tasting experience, it is the heart layer that primarily defines the richness and body characteristic of the espresso itself. Understanding this helps in recognizing how essential each layer is to the complexity and enjoyment of espresso.