What is the ideal grind size for espresso?

The ideal grind size for espresso is fine because it allows for optimal extraction during the brewing process. When making espresso, water is forced through the finely ground coffee under high pressure, which requires a grind that facilitates this process.

A fine grind increases the surface area of the coffee, allowing water to extract flavors and oils quickly and efficiently. This results in a rich and concentrated shot of espresso, characterized by its crema—a creamy layer that forms on top due to the high-pressure extraction process. If the grind is too coarse, the water will flow through too quickly, leading to under-extraction and a weak flavor. On the other hand, an extra fine grind can result in over-extraction, creating bitter flavors and clogging the espresso machine, making it difficult to brew properly.

In summary, a fine grind is essential for producing the strong and flavorful espresso that is desired, as it balances the water flow and extraction time effectively.