What indicates that espresso is properly extracted?

The indication that espresso is properly extracted lies in the presence of rich flavors, balanced acidity, and a nice crema. When espresso is extracted correctly, it showcases a harmonious combination of flavors that enhances the natural characteristics of the coffee beans. This means that the sweet, fruity, and nutty notes typical of quality beans are highlighted, resulting in a well-rounded taste profile.

A well-extracted espresso should also have balanced acidity, which contributes to a pleasant and vibrant taste without being overpowering or sour. The crema, a golden-brown foam that forms on top of a freshly brewed espresso, signifies freshness and proper extraction. A nice layer of crema is crucial as it not only adds to the visual appeal but also helps to retain the aromas, enhancing the overall drinking experience.

The other options present characteristics that indicate a variety of problems in the extraction process. Bitter taste, weak flavors, and burnt notes suggest issues such as over-extraction or under-extraction, which lead to undesirable flavors in the final shot of espresso. Therefore, option B aptly captures the essence of what a well-extracted shot of espresso should taste and look like.