Espresso Ratio

1:2 ratio
Typically, modern espresso is brewed around a 1:2 ratio, meaning that if you start with 20g of ground coffee in your basket you should aim for something like 40g of brewed espresso in your cup.

A fine grind is needed for espresso and the ideal pressure is nine bars. This, in turn, dictates a time of 25–30 seconds.

Calibration is simply the process of adjusting your grinder, moving the blades of the grinder closer or further apart, to ensure you get your desired outcome from the coffee. That outcome could be consistency or based on hitting a specific coffee recipe or hitting a specific taste/flavour.

other related videos:
Espresso
https://youtu.be/Z7dgvX3YkEM
Coffee tamping
https://youtu.be/2LWJV5g0RhY

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