What Is Espresso?
Espresso is a concentrated coffee extract obtained in a short time under high pressure. Grind size, dose, and flow control directly affect the cup result even with minor deviations.
Core Brewing Logic
In espresso brewing, the goal is to ensure that water passes through the coffee bed in a controlled and stable flow. The result is determined by three main variables:
- Dose: Coffee amount
- Grind: Determines flow rate
- Time / Yield: Extraction level
Reference Brewing Range
- Dose: 18–20 g
- Yield: 36–40 g
- Time: 25–30 seconds
- Temperature: 92–94°C
These values are starting points; minor adjustments can be made depending on the equipment and the coffee.
Brewing Flow
- Coffee should be ground as close to brewing as possible.
- The grind should be fine and controlled.
- The coffee bed should be prepared evenly.
- Tamping should be level and repeatable.
- The flow should begin thin, continuous, and stable.
Quick Adjustment
- Sour / weak: Grind finer, extend the time
- Too bitter: Grind coarser, shorten the time
- Unbalanced flow: Check distribution and tamping
Operational Notes
- Coffee tends to perform more consistently within the 5–14 day range.
- Machine cleanliness directly affects cup consistency.
- Water quality is a key factor in extraction balance.
- The same recipe may require minor optimization across different machines.