Coffee Maker Semi-automatic 19/20 Bar Stainless Steel Household Commercial Electric Espresso Coffee Machine With a 30-grinding EM3601

1. Water Boiler: The machine has a water boiler that heats water to the ideal brewing temperature, typically between 195°F to 205°F (90°C to 96°C).

2. Porta-filter: This is a handle-like attachment where ground coffee is placed. It typically has a metal filter basket.

3. Tamping: Ground coffee is placed into the porta-filter and then tamped down to a specific pressure to ensure even extraction.

4. Pump: The machine has a pump (usually a vibratory or rotary pump) that forces hot water from the boiler through the coffee grounds at high pressure.

5. Extraction: When the pump is activated, hot water is forced through the compacted coffee grounds in the porta-filter. This process extracts flavors and oils from the coffee, creating the concentrated shot known as espresso.

6. Crema Formation: As the pressurized hot water passes through the coffee grounds, it emulsifies the coffee oils to create a layer of crema—a creamy, caramel-colored foam—on top of the espresso shot.

7. Group Head: The porta-filter is locked into the group head, which is the part of the machine that dispenses the espresso into a cup.

8. Steam Wand: Many espresso machines also have a steam wand attached, which is used to froth and steam milk for drinks like cappuccinos and lattes.

9. Pressure Regulation: Modern espresso machines often have mechanisms to control and adjust the pressure and temperature settings for different types of coffee beans and brewing preferences.

Overall, the key to a good espresso shot lies in achieving the right combination of grind size, coffee dose, water pressure, and temperature, all of which work together to extract a balanced and flavorful espresso.