What is the effect of the grinding thickness of coffee beans on the flavor and taste? How to adjust the grinding degree of coffee beans

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How much does the grinding of coffee beans affect flavor and taste? How to adjust the coffee bean grinding thickness?

Different grinding methods have different tastes! The finer the beans are ground, the more bitter they release.

rough grinding

Drip quickly → Brew to a clean taste without impurities

If the coffee powder is ground coarsely, the hot water injected will drip rapidly, and the taste and aroma components cannot be fully extracted. However, the relatively miscellaneous flavor will not be completely released, and the finished coffee has a transparent feeling, a refreshing taste, a soft and sour taste.

fine grinding

Slowly dripping → Although the bitter taste is fully released, it is easy to have a miscellaneous taste if it is ground too fine

Fine coffee powder has the function of filter layer, coffee ingredients can be fully extracted. The finished coffee is rich and mellow. However, if the coffee powder is too fine, the ingredients will be over-extracted and it is easy to produce bitter taste.

When the powder is uneven

The speed of dripping varies → not only delicious, but also miscellaneous

If the coffee powder is not uniform in thickness, the extracted ingredients will also be released irregularly. The finished coffee has uneven concentrations of sour and bitter components, resulting in a mixed taste of strong and light flavors.

Grind to a uniform, moderate thickness

The secret to making delicious coffee is to extract the ingredients of beans in moderation. The finer the coffee beans are ground, the larger the surface area of the beans, and the more ingredients are extracted, but the bitterness of the coffee will also become heavier. On the contrary, the coarser the coffee beans are ground, the lighter the coffee concentration will be, the less bitter the bitterness will be, and the sourness will become more obvious instead.

Moreover, if the large and small powder particles are mixed, the dissolved ingredients will also be chaotic and uneven, and the taste of coffee after boiling may become unharmonious. Not only is it important to adjust the thickness of coffee powder, but it is also important to grind it evenly. When grinding, if the powder is generated, coffee is easy to have astringent taste, so the key point of selecting a bean grinder is to select the model that does not generate the powder and is the least likely to generate friction heat that damages taste and aroma.

4 Key Points of the Best Grinding Method

► Grinding suitable for extraction method thickness

► Coffee powder is evenly thick

► No fine particles

► No friction heat generated

I. Correlation between grinding degree and brewing equipment:

The factors affecting coffee flavor are not only the origin, but also different brewing equipment, hot water temperature, hot water contact mode and brewing time difference. Different brewing appliances also determine the thickness of beans ground, and different thickness affects the flavor of brewing. Generally speaking, the grinding degree of coffee beans can be divided into about 4 kinds:

1. Fine grinding: also known as "espresso grinding","Italian grinding".

Particle size: like white granulated sugar

Suitable for brewing machines: espresso coffee machine, turkish ibico pot.

2. Fine grinding:

Particle size: between white sugar and fine sugar

Suitable for brewing machines: drip pot, filter paper drip method and American coffee machine

3. Medium grinding:

Particle size: between fine and coarse granulated sugar

Suitable for brewing equipment: siphon type (plug pot), flannel filter bag

4. Rough grinding:

Particle size: like coarse granulated sugar

Suitable for brewing equipment: filter press pot, light drip filter pot, drip coffee machine

Second, the degree of grinding and coffee flavor changes:

Compared with coffee beans, ground coffee powder has an increased surface area exposed to air, resulting in an increased oxidation rate, a reduced shelf life, and a change in flavor due to temperature. During brewing, coffee will also be dialyzed to extract coffee according to the degree of grinding, and the brewing temperature and method of different grinding degrees will also affect the flavor of coffee. Thus the basic rule of induction is that the finer the grinding, the stronger the bitterness; conversely, the coarser the grinding, the less bitter.

coarse grinding

fine

Surface area small large

Less extracted components

Light concentration

bitter weak strong

Third, the focus of coffee grinding:

Coffee beans are ground into powder, which increases the surface area in contact with air and causes rapid oxidation. Coffee oil will also produce rancid taste due to oxidation, so the degree of grinding is also one of the keys to the success or failure of coffee. The key points of coffee bean grinding are as follows:

The best time to grind coffee beans is before brewing.

The lower the temperature produced by grinding, the better.

Try not to produce fine powder when grinding

Select the appropriate grinding degree according to various brewing appliances

4. Cleaning and maintenance of bean grinder:

Every time you taste a cup of coffee, you can't help washing cups, dishes, and brewing equipment. In addition to these needs, the bean grinder also needs to be carefully cleaned and maintained after each use. In addition to maintaining cleanliness and maintaining the durability of the equipment, the most important thing is that the next time you use it, the bean grinder will smell due to grease. The key points of cleaning and maintenance of bean grinder are as follows:

Carefully wipe the outside of the grinder.

Clean the outlet of the coffee powder.

Disassemble the grinder regularly, carefully clean the gears…etc. where grease is easy to get stuck.