The more interested you become in coffee flavors and their nuances, the more you notice the impact of coffee processing in the cup; it is a key step that makes a difference in flavor, even between two beans from the same tree.
Do you imagine that the bean reaches your cup exactly as it is from the tree? No — coffee beans have components and layers that must be handled first, so let’s get to know them...
What are the components of a coffee bean?
Imagine a ripe red coffee cherry. Inside it, there are usually two coffee beans, surrounded by several layers:
- Skin/Pulp: The outer layer of the cherry.
- Mucilage: A sticky, sugary layer beneath the skin.
- Parchment: A paper-like layer that protects the coffee bean.
- Silverskin: A very thin membrane that sticks directly to the bean itself.
What is coffee processing?
Coffee processing is the stage in which coffee cherries are handled after harvest, to separate the beans from the outer layers and prepare them for drying and then roasting. It is a fundamental step because it directly affects the coffee’s flavor, clarity, sweetness, and final body in the cup.
The main goal of processing is to remove the skin, mucilage, and parchment to الوصول to the green coffee bean, while preserving its quality and developing its latent flavors. The method used to do that is what makes a big difference.
What is the difference between regular coffee processing and specialty coffee processing?
Simply put, regular coffee processing usually focuses on drying and production in a more traditional and relatively fast way, while specialty coffee processing is carried out with greater care and more precise control at every step, aiming to bring out the best possible flavor in the bean.
Coffee processing is divided into two categories: classic (traditional) methods and modern methods.
Old coffee processing types:
- Washed
- Natural
- Honey
Modern coffee processing types:
- Anaerobic processing
- Aerobic processing
- Infusion
First: Classic coffee processing methods: the three main bean processing types
Three main types have formed the foundation of coffee processing for many years, and each one leaves its own signature in the coffee’s flavor and nuances:
1. Washed process
The washed process is a coffee processing method in which the outer layers of the coffee cherry are removed before drying, using water or fermentation to help separate the sticky mucilage from the bean. It is one of the methods that most clearly reveals the coffee’s flavor, because it allows the bean to express its origin in a cleaner and brighter way.
How is it done?
After harvesting ripe coffee cherries, the outer skin and the pulp surrounding the bean are first removed using water or fermentation, then the beans are thoroughly washed to remove any sticky residue, and after that, the drying stage begins. These steps allow the bean to go through a precise process that helps highlight its natural characteristics.
Flavor impact:
Washed processing produces a clean and clear cup, often with bright acidity and delicate, well-defined flavors. For this reason, it is one of the best methods for showcasing the bean’s original character, especially when the coffee has floral or light fruity notes.
Advantages:
- Clearly reveals the bean’s original flavor.
- Gives the coffee a clean and bright profile.
- Excellent for highlighting delicate floral and fruity notes.
Challenges or drawbacks:
- It requires more water compared to some other methods.
- It demands precise control over fermentation and washing.
- Any mistake in execution can affect the clarity of the final flavor.
Best for: Highlighting delicate floral or fruity notes and distinctive acidity that are naturally present in certain varieties.
2. Natural process
The natural process is one of the oldest coffee processing methods, in which the entire coffee cherry is dried as it is, without removing the skin or mucilage at the beginning. This method is known for giving the bean more time to interact with the sugars and natural compounds inside the cherry, which clearly affects the final flavor.
How is it done?
After harvesting ripe coffee cherries, the cherries are spread out whole on drying beds or surfaces under the sun. During this period, the beans are constantly turned and monitored until they dry evenly, after which the outer layers are removed once drying is complete.
Flavor impact:
Natural processing produces coffee with clearer sweetness, a heavier body, and bolder, deeper fruity flavors. The acidity is often lower than in washed coffee, while the overall cup profile feels fuller and more pronounced.
Advantages:
- Produces noticeable sweetness and strong fruity notes.
- Gives the coffee a fuller body and a richer cup experience.
- A method that expresses the bean’s character boldly and distinctively.
Challenges or drawbacks:
- Requires careful monitoring during drying to avoid damage or over-fermentation.
- Is highly affected by weather, humidity, and ventilation quality.
- Any drying mistake may lead to undesirable flavors.
- Browse our natural coffees
3. Honey process
The honey process is a coffee processing method in which the outer skin of the coffee cherry is removed, while part of the sticky mucilage is left on the bean during drying. It is called “honey” because this mucilage is sticky and sweet in texture, resembling honey in its consistency.
How is it done?
After harvesting ripe coffee cherries, only the outer skin is removed, while part of the mucilage remains attached to the bean. The beans are then laid out to dry slowly, with close monitoring during drying, because the amount of remaining mucilage and the drying time directly affect the final flavor.
Flavor impact:
Honey processing produces balanced coffee that combines flavor clarity with gentle sweetness and a fuller body. Its flavors are usually softer than natural coffees, but sweeter and smoother than washed coffees, which is why many people love it for sitting in a beautiful middle ground between the two.
Advantages:
- Offers an excellent balance between clarity and sweetness.
- Gives the coffee a fuller body than washed processing.
- Delivers a pleasant and approachable cup experience for many specialty coffee lovers.
Challenges or drawbacks:
- Requires precise drying control.
- Can be more sensitive to humidity and heat.
- Differences in mucilage amount may create inconsistent results if not carefully monitored.
Its variations: Color gradations (Yellow, Red, Black Honey) provide subtle differences in flavor and body.
Second: Modern methods for specialty coffee processing
1- Anaerobic processing
Anaerobic processing is one of the modern and experimental coffee processing methods, in which coffee cherries or beans are fermented inside sealed tanks that prevent oxygen from entering. This control over the environment creates a different fermentation reaction, which clearly and distinctly affects the coffee’s final flavor.
How is it done?
After harvesting the cherries, or in some cases after removing the outer skin, the coffee is placed inside airtight containers or tanks so that fermentation takes place in an oxygen-free or nearly oxygen-free environment. During this stage, the way yeasts and bacteria interact with the beans changes, creating a flavor profile that differs from traditional processing methods.
Flavor impact:
Anaerobic processing gives coffee more complex and bolder flavors, often with unconventional fruity notes, a pronounced sweetness, or even wine-like and fermented characteristics. For this reason, it is one of the methods that most attracts coffee lovers looking for something new and different.
Advantages:
- Produces unique and uncommon flavors.
- Gives the coffee a clear and distinctive personality.
- Ideal for those who enjoy bold experiments and layered flavor experiences.
Challenges or drawbacks:
- Requires very high control over fermentation and temperature.
- Can produce unbalanced flavors if not executed precisely.
- Not suitable for everyone, especially those who prefer clean and simple flavors.
2- Infusion processing
Infusion is one of the modern and experimental coffee processing methods, in which the coffee is soaked or exposed during fermentation to added elements such as fruits or flavoring materials, with the aim of giving it a different aromatic or flavor profile. It is considered one of the most intriguing approaches in specialty coffee because it offers an unusual experience unlike classic processing methods.
How is it done?
Infusion processing is carried out by placing the coffee in a fermentation or soaking environment where external ingredients such as fruits, spices, or other flavor-influencing materials are added. During this stage, the beans interact with their surrounding environment in a way that gives them distinctive characteristics unlike the coffee’s usual natural profile.
Flavor impact:
Infusion often produces coffee with clear and unconventional flavors, and it may carry fruity, aromatic, or even noticeably sweet notes. For this reason, it gives the cup a completely different personality and suits those who enjoy experimentation and exploring flavors beyond the familiar.
Advantages:
- Gives the coffee an innovative and different character.
- Adds bold and clearly noticeable flavors.
- Suitable for those who enjoy new experiences and flavor surprises.
Challenges or drawbacks:
- It is not a traditional method known to all coffee lovers.
- It can be controversial among some specialty coffee professionals.
- It requires precise execution so that the added flavors do not overpower the bean’s original character.
3- Aerobic fermentation
Aerobic fermentation is a stage in which coffee is processed in the presence of oxygen, whether during fermentation or during some drying stages. The term is used to describe the environment in which the beans interact naturally with air, making it closer to traditional open processing methods.
Although aerobic fermentation is often mentioned in discussions of coffee processing, it is not an independent processing method so much as a description of a stage that takes place in the presence of oxygen. It is therefore commonly used to describe the fermentation or drying environment and distinguish it from modern anaerobic processing.
How is it done?
In this method, the coffee is left to interact with air during fermentation or drying, without being isolated in sealed tanks. This allows oxygen to pass through the process, unlike anaerobic processing, which takes place in a sealed environment that is nearly free of air.
Flavor impact:
Aerobic fermentation usually results in coffee that is clearer and more balanced in taste, with flavors closer to a traditional and clean profile. The flavors may not be as bold as those found in anaerobic or infused coffees, but they give the cup a natural and familiar character for many coffee drinkers.
Advantages:
- Closer to traditional processing methods.
- Helps achieve a balanced and clear flavor.
- Does not depend on complex fermentation or isolation.
Challenges or drawbacks:
- It does not always deliver the layered or unconventional flavors that some people seek.
- It may be less exciting than modern experimental methods.
- It requires good control of time, temperature, and humidity to maintain bean quality.
Third: Experimental and unconventional processing methods
When we talk about specialty coffee, we find that innovation never stops, as producers and roasters constantly seek new ways to highlight flavors or create different experiences. In this context, some experimental processing methods may appear in the coffee world.
- Carbonic maceration: Inspired by the wine industry, in which whole coffee cherries are fermented in an environment rich in carbon dioxide, which may give the coffee bright fruity notes and a distinct wine-like character.
- Lactic fermentation: This method encourages lactic acid bacteria during fermentation, often resulting in a smoother body, clearer sweetness, and more complex acidity.
- Infused or soaked fermentation: External ingredients such as fruits or spices are added to the fermentation environment, directly affecting the flavor, though it remains controversial among some professionals.
- Innovative drying methods: Such as precise control of temperature and humidity or the use of specialized drying environments to improve quality and consistency.
After all these details, and with the many types and methods of specialty coffee processing, one may wonder: What is the purpose of all this?
Although processing methods may seem numerous and complex, they ultimately aim to bring out the best that a coffee bean can offer and create a more distinctive and clearer flavor experience. This is what makes every step in processing an essential part of the coffee journey, from farm to cup.
Our commitment at Microlot
At Microlot, we constantly search for coffee that represents the best examples of meticulous processing. Whether it is the clarity of the classic washed process, the bold sweetness of natural coffee, or the complexity of innovative anaerobic processing, we strive to offer you crops that have been cared for at every step, so you can enjoy an unforgettable coffee experience.
Discover the impact of processing for yourself!
The best way to understand the difference is through tasting! We invite you to browse our diverse coffee collection and read the processing descriptions and expected flavor notes for each lot. Try a washed coffee alongside a natural coffee from the same region, or embark on an adventure with an anaerobically processed coffee.