Espresso
Dose
The weight of dry ground coffee loaded into the portafilter basket for an espresso shot, measured in grams. A standard double-shot dose ranges from 17 to 20 grams depending on basket size and recipe.
詳細分析
Dose is the first variable set when building an espresso recipe; yield and grind size are then adjusted relative to it. Increasing the dose without changing the basket can compress the puck excessively, restricting flow and extending shot time. Decreasing it leaves headspace that allows water to pool above the puck, promoting uneven extraction. Precision baskets are rated for specific dose ranges (e.g., 18–21 g for a VST 20 g basket). Single-dosing workflows—grinding exactly one dose of beans per shot—have become standard in specialty home espresso to minimize grind retention.