Espresso is a complex beverage characterised by a signature layer of crema. For some, the crema is seen as a fundamental part of the espresso. For others, it’s viewed as an unnecessary byproduct of the extraction process.

Read the article: https://perfectdailygrind.com/2020/04/crema-how-its-formed-what-it-tells-us-how-to-learn-from-it/