Make a perfect cup of espresso

One: the choice of coffee maker

1. Boiler capacity: if the boiler capacity is large, the effluent temperature is stable and the coffee quality is stable.

two。 Coffee machine temperature: whether it remains stable or not also affects the quality of coffee.

3. Atmospheric pressure: it is ideal to make coffee with nine air pressure values.

4. Effluent temperature: the international standard coffee machine effluent temperature is 90 °C, which should also be adjusted according to the roasting degree of coffee beans. If the roasting degree of coffee beans is deeper, the effluent temperature of the coffee machine will be reduced, otherwise the extracted coffee is easy to have scorched and bitter taste. The SPR used in the store is suitable for production with effluent temperature from 90 °C to 91 °C.

Note: the effluent temperature of coffee production refers to the outlet temperature of the machine head, which is different from the direct hot water output temperature of the boiler.

Second: the choice of coffee beans

1. The main characteristics of Arabica (also known as Gaoshan bean):

The fragrant smell is strong.

It's not easy to taste bitter.

Creama (coffee oil) content is moderate

High acidity

The caffeine content is 30% of Robusta and 40% of it.

2. The main features of Robusta:

The aroma is poor

It is easy to taste bitter after deep baking.

More Creama

Low acidity

It's high in caffeine.

Three: the preservation of coffee beans

1. Unopened coffee beans:

Suitable for storage in a cool, well-ventilated environment, the temperature is suitable for 18 °C-22 °C. Try not to put it in a dry place (the humidity is too dry below 54%), so its storage environment is similar to that of red wine.

two。 Opened coffee beans:

When the coffee bean comes into contact with the air, its flavor begins to lose, while the area of a complete coffee bean in contact with the air is limited, but the coffee bean forms a powder after grinding, and countless noodles come into contact with the air, which speeds up the loss of flavor. Therefore, when making coffee, grind and use it as much as possible, so as to ensure the quality of each cup of coffee. As for the preservation of open coffee beans, it is suitable for sealed preservation, but do not put them in a too humid environment, because coffee beans are afraid of moisture, and the oil of coffee beans is easy to lose, and the flavor will become worse.

Key points for preservation of coffee beans:

Whether the coffee beans are opened or not, they are afraid that the environmental humidity is too high.

Coffee beans, whether opened or not, their preservation environment can not be mixed, especially not suitable for storage in the refrigerator.

After the coffee beans are opened, as long as the packaging is sealed correctly, it can be accepted for use within three days (the longest is no more than five days), but also pay attention to the preservation environment.

Ground coffee beans are best used immediately.

Human factors

1. Base espresso:

Barista (barista) should know how to use espresso, because as long as espresso is made perfectly, other fancy coffee is easy to ensure its quality, so espresso is the foundation of Italian coffee; so if you want to master espresso, you must first learn how to drink and taste espresso.