"Preservation of coffee beans" is one of the controllable factors in the taste of a cup of coffee.

Coffee belongs to fresh food, as long as it comes into contact with air, it is easy to oxidize, so these beans must be drunk within the shelf life, otherwise they will belong to "bad beans"? See how to preserve beans is correct, how to judge the quality of coffee beans.

Points for attention in the preservation of coffee beans:

1. Try to buy fresh coffee, usually one-way valve packaging, please pay attention to the production date on the packaging, of course, the closer to the purchase date, the better. It is recommended to buy half a pound of packaging, even if you need a pound of beans. Because it can prolong the shelf life of coffee properly without opening the package.

two。 Open coffee beans should be kept away from light in a sealed bottle, choose a sealed bottle with good sealing, and keep it in a place that avoids direct light source as far as possible. If your sealed bottle is transparent, dark paper can be used outside the sealed bottle.

3. Please don't keep the coffee beans in the refrigerator. This is not the right way. Too low temperature will lock up the aroma of coffee.

4. Please finish the unsealed coffee within two weeks, which is why it is recommended that you buy half a pound of coffee.

5. If there are conditions, it is best to have a bean grinder to grind the beans before brewing coffee. If you ask the coffee shop to grind the beans for you at the time of purchase, the fresh-keeping time of the coffee powder will be shortened and you should drink it as soon as possible. Because the coffee is ground to increase the contact area between the coffee and the air, the aroma and flavor will evaporate more quickly.

How to judge the quality of coffee beans

Judgment of appearance:

Delicious coffee can be known from the shape of its roasted coffee beans, of course, there can be no bad coffee beans mixed with, what is more important is that normal beans will also be mixed with high-quality coffee beans and cause hindrance. A fried roasted bean that brews delicious coffee must first be big, fat and uniform, and secondly, it must be of the same size without color spots. These are the main points of visual discrimination, if you look carefully, it should not be difficult to distinguish.

Fermented beans: coffee beans that fall from the soil before harvest. The sour smell will have a great impact on the taste of coffee.

Dead beans: also known as unripe beans, or affected by climate and other factors, imperfect development, fried spots will be produced after roasting, so that the coffee has a green taste.

Black beans: fermented beans, rotten, blackened coffee beans. Because it is black, it can be distinguished from normal coffee beans at a glance.

Borer beans: coffee beans eroded by insects

Defective beans: may be stuck during work, or carelessly handled during handling, resulting in incomplete coffee beans. Will cause fried spots when baking, and will produce bitter and astringent taste.

Others: remaining thin-skinned beans, bad beans, dried beans that do not completely produce sour taste, shell beans with only shell, and so on.

The judgment of time:

To see if the packing date is recent, the shelf life of coffee beans is generally one year, and the shelf life of coffee beans is less than one month, so it is best to use coffee beans baked within a month. Freshly roasted coffee beans have the most charming aroma and rich taste.

Judgment during grinding:

After fully roasting and extracting water, the coffee can be brewed into delicious coffee, which can be judged by grinding. When grinding, good coffee beans will gently make the sound of salad salad, gently shake the hand, the original taste of coffee is overflowing. Shoddy coffee beans have a creaking sound. There is a feeling of sticking during grinding.

Judgment at the time of extraction:

The easiest way to make delicious coffee is to sigh the filter paper. When brewing and extracting, there is also a way to judge whether the coffee is delicious, that is, when it is in hot water, the powder is not inflated, and when the coffee is fully roasted and extracted water, there will be a beautiful and meticulous foam puffing up.

Judgment after extraction:

Although the concentration of coffee will change due to different roasting degree and extraction method, the characteristic of delicious coffee is that the coffee liquid extracted under the same conditions is clear. The spoon can be clearly seen through the extract in the picture below, while the one in the stone picture is almost invisible. It is difficult to tell whether a cup of coffee is delicious, but if you compare it, you can see whether the coffee is delicious or not. even after 30 minutes, the color of a delicious cup of coffee is still clear and the taste will not change.

Judging from the taste and aroma of coffee:

The sour taste of delicious coffee is as refreshing as citrus fruit, without strong sour taste. Bitterness is a soft bitterness. There is no bitterness like cigarette or scorch.

Judging from the quality of raw beans:

The shape, grinding stage, stroke, post-stroke, taste and flavor stages have been discussed before, as the focus of judging whether the coffee is delicious or not, but these are all for completely roasted coffee beans. Raw beans are green before roasting, commonly known as (Green). If the quality of raw beans is poor, no matter how hard you cook them, you will not be able to make beautiful coffee. Raw beans are usually exported from the place of origin two months after harvest, and this year's crop is called New Crop. After a year, it's called Past Crop. After a longer period of time, it is called Old Crop. Coffee beans are crops, and their freshness will naturally affect their taste. Fresh raw beans can enjoy the distinct characteristics and vibrant flavor of each variety. Take rice as an example, if it is placed for a long time, its original flavor will be diluted with the loss of water. Fresh raw beans, showing a bright green distinction. Except for freshness. No matter what kind of variety, we should also try to choose raw beans with large particles and no color spots.