How to choose fresh coffee beans_What brand of coffee beans is good_How to buy coffee beans

Professional coffee knowledge exchange More coffee bean information Please pay attention to coffee workshop (Weixin Official Accounts cafe_style)

In the era of online shopping, coffee beans are the key to drinking good coffee in the face of dazzling goods. It takes a certain skill to buy good coffee beans online. What is the relationship between coffee beans and freshness? Should we buy coffee beans that look "oily" or "not oily"? What brand of coffee should I buy?

Coffee beans are chosen according to similar criteria as tea leaves. To get the most expensive and elegant tea, you need to go to the country of origin and buy the best quality new tea of the year. The same is true of coffee, the most top coffee beans, often also need you to pick in this variety of coffee origin, or entrust foreign specialized suppliers to buy.

Therefore, if you want to pick good coffee beans, the choice of physical stores is relatively limited, and online shopping is a very good way. After receiving the beans purchased online, how to judge whether the beans are fresh?

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see

If you are buying single-item coffee beans, then you will grab a handful of beans with your hand, about 10 or so, to see if the color of each coffee bean is consistent, whether the particle size is average, and whether the shape is the same, so as not to buy inferior products disguised as mixed beans. However, if it is a comprehensive bean, the size and color are different, which is normal. Coffee beans produced by strong fire and deep roasting will produce oil. However, if the light baked degree of beans out of oil, it means that it has deteriorated, it not only reduces its mellow degree, but also will appear astringent and sour taste.

Have you ever seen coffee beans that look oily? Why do some coffee beans have a shiny surface, while others are "dry and comfortable" and not greasy? What is the relationship between coffee beans and freshness? Should we buy coffee beans with "oil" or "no oil" appearance?

Coffee oil that is not oil

These "oils" evenly distributed on the surface of coffee beans are not actually "oils", but water-soluble organic substances that look like oils. Coffee oil itself contains a lot of coffee aroma components that dissolve in water, so the surface of your brewed coffee does not float a layer of greasy grease.

Two reasons for "oil beans"

Two reasons for "oil beans" a) not fresh light baked beans b) Fresh deep-baked beans. The following is an in-depth discussion.

a) stale light baked beans

Light baked beans, which are light brown in appearance, dry in appearance after baking and do not produce oil. About five days out of the oven (it may be shortened to one or two days in high summer), the phenomenon of "dot oil" begins to appear (a dot oil droplet appears on one side of the coffee bean) Please note: a little "dot oil" does not mean that it is not fresh, but sometimes the flavor of the light roasted coffee bean is at its peak. Continue to put down, after more than two weeks out of the oven, the surface of the light baked beans gradually issued a layer of uniform, thin and bright oil, smell not sweet taste, but with the smell of fuel consumption, at this time, the flavor of "light baked beans" has declined, should avoid buying.

b) Fresh deep-baked beans

Deep baked beans with dark brown appearance appear slightly oily after baking, and a large amount of oil begins to appear on the surface from the first day to the second day after baking. The appearance of oily "dark baked beans" does not mean that they are not fresh. On the contrary, the appearance of oily beans will gradually dry out after three weeks, and finally become dry and tasteless beans. Therefore, if you see coffee beans that are dry and not oily, but appear dark brown in appearance, please pay special attention to whether they indicate the roasting date, which is most likely to be stale beans that have deteriorated.

Even if it is not fresh, the appearance of oil "light baked beans", after a long time (such as three months) after the appearance will gradually dry, and finally return to the appearance of dry oil. It can be seen that whether the appearance of oil is only a reference to judge the freshness of coffee beans, not absolute.

First of all, please purchase from a professional coffee roaster who clearly labels the date of the product, has a brand reputation, and emphasizes fresh roasting. In addition, good coffee bags usually have a "one-way vent valve"(a button-like hole in the top of the coffee bag) design for the coffee beans to vent naturally produced carbon dioxide. The one-way exhaust valve at the nose, gently squeeze the coffee bean bag, smell the squeezed gas taste, if it is a charming aroma of coffee, freshness is not a problem, on the contrary, if it smells not strong enough, or even with the smell of smelly oil, it means that this packet of coffee has long deteriorated and should be avoided.

● So why do coffee beans use one-way valve bags?

1. Roasted coffee beans are sealed and packaged in aluminum foil bags to avoid contact with light and air, which can lead to rapid aroma emission and oxidation.

2. "One-way exhaust valve" coffee bag can isolate the light and air intrusion outside the packaging bag, so that coffee beans can be kept fresh and original in the best preservation and packaging state.

3. Roasted coffee beans will naturally emit carbon dioxide, such as the accumulation in the packaging bag will affect the quality of coffee beans, and the bag on the "one-way exhaust valve" can let the bag of excess gas exhaust, and when buying coffee can squeeze the packaging bag smell.

The packaging is designed with a double-layer valve made of film on the sealing of the packaging bag. After the roasted beans are filled, the carbonic acid gas generated after roasting will be discharged from the valve, and the gas outside will not enter the bag, which can effectively maintain the original aroma and essence of the roasted coffee beans. This is currently the most recommended packaging method for roasted coffee beans, and you should try to choose coffee products with this packaging when purchasing.

To put it more bluntly, this valve is only out and out. After roasting coffee beans, carbon dioxide and other gases will be produced, which need to be slowly discharged. The one-way exhaust valve is packaged on the coffee bag, and holes are punched on the surface of the bag where the one-way valve is packaged, so that the carbon dioxide precipitated from the roasted coffee beans can be automatically discharged out of the bag, and the air outside cannot enter the bag. Effectively ensure that the coffee beans dry and mellow flavor, but also because of the accumulation of carbon dioxide to make the bag open, while preventing the coffee beans from being outside the air to enter and accelerate oxidation.

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smell

Smell the beans to see if they smell like coffee beans. If they smell like coffee beans, they smell fresh. If the aroma is very weak, or even has appeared similar to the greasy taste of peanuts for a long time, it means that the beans are completely stale, do not choose it, because no matter how much effort is spent, it is impossible to make good coffee.

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peel

Coffee beans are peeled by hand, and if the beans are fresh enough, they are easy to peel, accompanied by a crunchy sound. If the beans are not fresh, they require a lot of effort to peel. After peeling, you can see whether the degree of baking is uniform. If uniform, the outer and inner layers of coffee beans are the same color. If the surface color is much darker than the inner color, it means that the roasting temperature may be too large, which will also affect the aroma and taste of the coffee beans.

● Chewing

When choosing, it is best to take one or two beans in the mouth to chew, if the beans are very crisp, chewing up crisp sound, it means that the beans are not wet; in addition to this can make you overflow teeth fragrance, that is the top grade!

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Is there enough bubbles when brewing

Freshly roasted coffee beans, because the beans contain a lot of gas, respiration is strong, during extraction, the gas released from the beans, we see is the wonderful fullness of bubbles, there is a very image adjective,"bloom." Yes, when fresh coffee beans are extracted, clusters of rich bubbles bloom like flowers this season. Accompanied by the rich aroma of fresh coffee beans.

A Study of Bubble Abundance or Not

When extracted, the fullness of bubbles is positively correlated with freshness. The fresher, the more bubbles. However, there is a premise here. For the same coffee bean. To be exact, it was the same raw beans, the same baking, and the same operation.

Different coffee beans, or different roasting degrees of the same coffee bean, or different operating coefficients of the same coffee bean, the fullness of bubbles will have different manifestations.

To sum it up: the fresher the coffee bean, the richer the bubbles; the same coffee bean, the deeper the roast is, the richer the bubbles are than the lighter the roast.

● [Notes]:

Although we can't see the real thing before buying, we can't choose steps such as looking, smelling, peeling, chewing, etc., but online shopping can still be selected from the following aspects, of course, these aspects are also applicable to physical store purchase.

A. Origin

Some online stores may use coffee beans that are not from the country of origin, such as Blue Mountain coffee, but its origin is not Jamaica. However, this is not to say that non-native coffee is bad. Because of the different climate, the taste will be slightly different. Many times non-native coffee is cheaper. If you're not fussy, it's okay to try different origins.

B. Packaging date

Pay attention to whether the packaging date is the latest, the shelf life of coffee beans is generally one to two years, and the shelf life of cooked beans after roasting is within one month, so choose freshly roasted coffee beans and use them within the shelf life after purchase, so as to enjoy the most charming aroma and rich taste of coffee.

C. Stores and brands

Needless to say, some coffees may be mixed with other kinds of coffee in order to reduce costs. So be careful. For example, in the more expensive coffee beans doped with cheap coffee beans, or in the good quality coffee beans doped with the same variety but poor quality coffee beans, this will seriously affect the taste. Therefore, when buying coffee beans, try to choose a guaranteed store or brand, or look at the evaluation index of netizens.

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