The way coffee is extracted. Immersion extraction. Coffee extraction.

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The principle of immersion extraction, as the name implies, is to let the coffee powder soak in a container, interact with hot water for a period of time, dissolve and diffuse to release the flavor and aroma of coffee smoothly, and complete the extraction before the miscellaneous flavor is precipitated. Compared with hand washing, the variation of immersion extraction is relatively small. Common immersion extraction utensils include French filter kettle, siphon kettle, and Philharmonic pressure, etc. One of the most common utensils is the French filter kettle, which is very popular because it is very easy to operate and does not need to add filter paper, so it can quickly extract full-bodied coffee.

However, when soaking extraction is used, it does not mean that the filtering steps can be omitted. For example, Philharmonic pressure requires filter paper or metal strainer to filter coffee liquid, while siphon coffee maker is equipped with a filter composed of spring hook, mesh and filter cloth. Filter paper or metal strainer can also be used. Matching different filters will also have an impact on the flavor. For example, the flavor of coffee made with Philharmonic pressure and filter paper is different from that made with metal filter. Because the filter paper will absorb oil, the Philharmonic press with metal filter will have a thicker taste, while the siphon pot coffee with metal filter will occasionally produce a metallic taste, the coffee will be made with a sharp taste, and the taste of the ceramic filter is relatively warm and moist, and it is not easy to have residual taste.

Although the variation of water injection in the process of hand flushing is reduced, the appearance of coffee is greatly affected by the collocation and use of utensils. Each brewing appliance has its own corresponding brewing process, which also includes a variety of different factors, such as bean grindability, water-powder ratio (the ratio of coffee to injected water), water temperature and time, and so on. If you want to find your favorite flavor, you can first try to set the parameters of different factors and test them one by one before you can find the module that is most suitable for you and steadily extract the flavor you want.