What role does crema play in espresso?

Crema plays a significant role in espresso, as it is a rich, golden foam that forms on top of a well-pulled shot. This layer is a sign of freshness and high-quality extraction, indicating that the espresso beans have been properly prepared and brewed. When crema is present, it means that essential oils from the coffee have emulsified during the extraction process, contributing to the overall flavor, aroma, and texture of the espresso. The presence and quality of crema can be a good indicator for baristas and coffee enthusiasts, as it often suggests that the espresso has been made with fresh coffee beans and optimal brewing techniques. Additionally, crema adds to the sensory experience of drinking espresso, affecting both the taste and the aroma, thus elevating the overall quality of the beverage.