An espressoA small coffee beverage, about 20 ml, prepared on an espresso machine where pressurized hot water extracted through compressed coffee.: In its most stripped-down, basic form, this is... machine is said to use pre-infusion if it applies a moderate amount of pressure to the coffee before applying full brew pressure. Pre-infusion is often said to improve extractionRefers to the process of infusing coffee with hot water. Hot water releases or "extracts" the flavor from the roasted, ground coffee. The term is used mostly with... by causing the coffee to swell, filling fissures in the puck that might otherwise cause channelingChanneling refers to the formation of small water jets during espresso brewing due to poorly distributed grounds. When high-pressure water is forced toward the espresso puck, the water....
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