May 31


Explore Honey Processing Method for Robusta Coffee Beans

By Hanson Cheng

May 31, 2023

Honey processing method for Robusta coffee beans is a unique and relatively new way of processing coffee beans that is steadily gaining popularity among coffee producers. This method involves leaving some or all of the mucilage (sticky layer) intact on the beans during the drying stage after harvesting. Unlike traditional processing methods, honey processing relies on nature to develop the flavor profile of the beans. This article will explore the honey processing method in detail, including its benefits and drawbacks, and how it affects the final taste of Robusta coffee beans.

Overview Of Honey Processing Method

Robusta coffee beans are a type of coffee plant that is commonly grown in Africa and Asia. Unlike Arabica coffee beans, Robusta beans have a higher caffeine content and are generally considered to have a harsher, more bitter flavor. Despite these characteristics, Robusta beans are prized for their strong, distinct flavor profile and reliability in crop yield. One processing method that has gained popularity in recent years for Robusta beans is the honey processing method.

This method involves leaving some or all of the sticky-sweet mucilage, or “honey,” around the coffee bean while drying, which imparts a unique flavor to the final product. The honey processing method for Robusta coffee beans has become increasingly important due to its ability to create a high-quality, distinct taste that sets it apart from other types of coffee.

Additionally, this method is favored by many farmers as it requires much less water than traditional processing methods, making it a more sustainable and environmentally friendly option. As such, the honey processing method has become a significant aspect of the Robusta coffee industry, both in terms of taste and sustainability.

Objective of the study

The objective is to provide comprehensive information about the honey processing method for Robusta coffee beans. This subsection aims to establish the scope and purpose of the article and assist in achieving the primary goal of creating awareness and promoting the honey processing method. 

It is hoped that this article will enable readers to understand the potential of the honey processing method and its significance for Robusta coffee beans. Additionally, it will serve as a valuable resource for coffee farmers and industry professionals, enabling them to make informed decisions about the processing method to use for their crop. 

Its significance

One of the significant aspects of honey processing method for Robusta coffee beans is the unique flavor profile it produces, which has become increasingly popular among coffee consumers. The honey process, which involves leaving some or all of the sticky pulp on the coffee beans during the drying process, results in a flavor that is derived from the coffee cherry, rather than just the bean.

This flavor profile is distinct from other processing methods, such as washed and natural, which can produce a more uniform taste but may lack depth and complexity. Honey processed Robusta coffee beans are known to exhibit a sweetness and fruitiness that is reminiscent of honey, with notes of floral, citrus, and chocolate undertones.

Additionally, honey processing benefits the environment and the farmers, as it requires less water than washed processing and can lead to higher prices for the beans, which can help to improve the livelihoods of Robusta coffee farmers who may struggle with low market prices. Thus, the honey processing method holds significant value for both coffee enthusiasts and the communities that produce it.

Honey Processing Method

Harvesting stage

Harvesting is an essential stage in the coffee processing method, which involves the selection of ripe coffee cherry for the production of high-quality coffee beans. The timing of harvesting is crucial as the coffee cherry must reach its maximum maturity level before it is picked. The harvesting process for Robusta coffee beans is manual and involves selecting only the ripe cherry. The coffee cherry’s maturity can be identified by its color, as the fruit changes from a green color to a deep red or yellow color when ripe.

During harvesting, it is essential to handle the coffee cherry with care to avoid damaging the beans inside. Quality coffee beans are obtained only from healthy cherry, which are free of pests, diseases and other damages. To maintain quality, it is necessary to ensure proper harvesting practices, such as picking the cherry by hand, using baskets to transport the cherry and minimizing the time between harvesting and the start of the depulping process.

Depulping stage

Depulping is one of the most critical stages in the processing of Robusta coffee beans. This stage involves the removal of the outer layer of the coffee cherry, which is also known as the pulp. The primary objective of depulping is to extract the beans while preserving their intrinsic qualities. While traditional methods of depulping involve the use of mechanical devices, modern techniques leverage advanced machinery to ensure a more efficient and precise process.

In either method, the beans undergo rigorous washing to eliminate any remaining impurities. The depulping stage is particularly important because it sets the foundation for the subsequent steps in the honey processing method. The degree to which depulping is carried out directly affects the quality of the final product.

Fermentation process

The fermentation process is an essential step in honey processing Robusta coffee beans. This stage is crucial as it allows for the removal of the mucilage layer, which covers the coffee bean. During fermentation, enzymes break down the mucilage layer, allowing for easier separation from the coffee bean.

The fermentation process usually takes between 24 to 48 hours, depending on the desired results. The fermentation process is carried out without water, making it a dry fermentation method. This method is preferred as it results in a more balanced and uniform flavor profile. The fermentation process is complete when the mucilage layer has been successfully removed from the coffee bean.

Drying process

The drying process is a crucial step in the honey processing method for Robusta coffee beans. After fermentation, the coffee beans are washed, and then they are spread out to dry. Drying the coffee beans correctly is essential to ensure that the coffee beans have the right moisture content. If the beans are dried too quickly, the flavor and aroma can be affected, and if they are dried too slowly, they can become moldy.

The most common method of drying coffee beans is sun drying. In this method, the coffee beans are spread out on a concrete patio or raised beds to dry in the sun. The beans must be regularly turned so that they dry evenly. Another method of drying coffee beans is mechanical drying, where air is circulated at a controlled temperature to dry the beans. However, this method is not commonly used in honey processing as it can affect the flavor and aroma of the coffee beans. Once the coffee beans are dried, they are ready for the next step- milling.

Milling process

The process of removing the parchment layer from the coffee beans, known as milling, is a crucial step in the production of Robusta coffee beans processed with honey. This process requires attention to detail and careful handling to ensure the beans are not damaged during the removal process. Milling can be achieved using different methods, including the dry and wet methods. The wet milling method involves soaking the beans in water to soften the parchment layer, making it easier to remove. The softened layer is then removed using a machine called a pulper, which gently separates the beans from the parchment.

The dry milling method, on the other hand, involves removing the parchment layer without soaking the beans in water. In this method, the beans are first roasted to loosen the layer. Next, they are passed through a machine that removes the parchment layer using pressure. Both milling methods have their advantages and disadvantages, and the choice of method depends on various factors, including the processing facility’s setup and the desired end product.

Millers must also ensure that the beans’ quality is maintained during the milling process. Poor quality milling can result in the bean’s defects, affecting its taste and aroma. Millers must, therefore, ensure that the milling machines are properly maintained and calibrated to ensure the beans’ uniformity. They must also sort the beans by size and density to ensure that only beans of the same quality are roasted together. This sorting ensures that the beans roast evenly, resulting in a consistent flavor and aroma profile.

The parchment layer removed during the milling process can be repurposed as fertilizer or fuel. The parchment layer contains high levels of nitrogen and phosphorus, making it an excellent soil amendment when added to compost. The parchment layer can also be burned to provide fuel for the coffee processing plant, reducing the facility’s reliance on external sources of energy.

Advantages Of The Honey Processing Method


The flavor of Robusta coffee beans is greatly influenced by the honey processing method. Honey processed Robusta beans have a distinct sweet taste, with a smooth and creamy texture. A medium roasted honey processed bean is known to have a bright acidity level, which adds hints of fruitiness to the coffee. In contrast, a darker roasted honey processed bean has a deeper, richer nutty flavor with a lower acidity level.

The honey processing method also adds to the complexity of the coffee, with various tasting notes ranging from brown sugar, caramel, and chocolate to floral and fruity undertones. This unique flavor profile is a result of the bean’s exposure to the natural sweetness of the mucilage during the honey processing method. The honey processing method is a perfect fit for Robusta coffee beans, as their inherent earthy and bold flavor complements the honey processing method’s unique sweetness.

The honey processing method’s flavors are known to vary according to weather conditions, location, and processing methods, making each bean unique. The flavor of the honey processed Robusta beans is not only unique but also consistent as the honey processing method reduces the risk of defects and enhances the coffee’s natural flavor. Therefore, the honey processing method is an essential method for producing high-quality Robusta coffee beans that surpass the expectations of coffee experts and connoisseurs alike.


When it comes to the sustainability of coffee processing methods, honey processing stands out as one of the most eco-friendly options among the various methods available. Unlike other methods that require large amounts of water, honey processing is a water-conserving method that uses minimal amounts of water. This means that there is less water waste, which is not only better for the environment but also helps to conserve resources. Additionally, honey processing also reduces the pollution levels since it uses significantly less water, thereby reducing the amount of wastewater generated in the process.

Honey processing also reduces energy consumption during coffee production, which is another way in which it is more sustainable than other methods. Since honey processing requires less water, it also requires less energy to heat the water used in the process. As a result, honey processing is a more energy-efficient option, which means that it reduces the carbon footprint of coffee production. Furthermore, the use of less water also results in less wastewater, which further reduces the energy needed to treat and dispose of the wastewater generated by the coffee processing.

One of the most significant benefits of honey processing is its potential to reduce the environmental impact of coffee production. By reducing water waste and energy consumption, honey processing helps to reduce greenhouse gas emissions, which is vital for mitigating the effects of climate change. This also means that honey processing has the potential to set the standard for sustainable coffee production. By adopting more eco-friendly production practices like honey processing, coffee producers can meet the growing market demand for sustainable and ethically produced food products worldwide.

Overall, honey processing is a more sustainable coffee processing method that offers a range of benefits to producers and consumers alike. With its water-conserving and energy-efficient properties, honey processing has the potential to reduce the environmental impact of coffee production significantly. By adopting more eco-friendly production practices like honey processing, coffee producers can produce high-quality and flavorful coffee while minimizing its environmental impact.


One important aspect of honey processed Robusta coffee beans is their increased marketability. This is due to several factors, including the unique flavor profile that honey processing creates. Additionally, buyers are often willing to pay a premium for coffee that is sustainably produced, and honey processing is one such method that is gaining popularity for its sustainability.

Furthermore, the demand for specialty coffee is on the rise, and honey processed Robusta beans offer a unique and highly desirable product that can help meet this demand. When marketed effectively, such beans can greatly enhance the reputation of a coffee roaster or retailer, and attract a loyal customer base.

Disadvantages Of The Honey Processing Method


One of the significant considerations in choosing a processing method for Robusta coffee beans is the cost involved. The honey process, also known as the pulped natural process, is a middle ground between the natural and washed processing methods and involves leaving some of the sticky fruit or mucilage on the bean while it dries. The honey processing method requires less water than the washed method and less labor and machinery than the natural method, making it a cost-effective option for many coffee growers.

The honey process results in a flavor profile that is unique and complex, providing a balance between the sweetness of natural processing and the clarity of washed processing. The cost involved in honey processing varies depending on the origin and the specific farm.

However, honey processing can offer some significant economic benefits for growers, such as the ability to command a higher price for their specialty coffee. The honey process, when done correctly, produces robusta beans with a tantalizing sweetness, crisp acidity, and rich body. It is an excellent option for growers who want to produce high-quality robusta coffee beans at a lower cost compared to washed processing.

Risk of Spoilage

During the honey processing method for Robusta coffee beans, there is a risk of spoilage during the fermentation process. This risk arises due to the presence of excess moisture, high microbial activity, and prolonged fermentation. The risk of spoilage can lead to a significant loss of coffee beans, lowering yield, and subsequent loss of revenue. Spoilage can also lead to the production of off-flavors and off-aromas, which can ruin the overall quality of the coffee, making it less appealing to consumers.

Several factors can contribute to the risk of spoilage during the honey processing method. First is the absence of specific monitoring protocols for fermentation. This can lead to a lack of control over the various stages of fermentation, which can lead to the overproduction of negative bacteria and yeasts. Second is the inadequate drying process, which can encourage the growth of microorganisms during storage.

Third is the use of low-quality beans, which can have several defects contributing to spoilage. Fourth is the absence of proper storage facilities, leading to exposure to environmental factors such as heat and humidity that promote spoilage. To reduce the risk of spoilage during the honey processing method, several measures can be put in place. First, the fermentation process should be closely monitored and regulated to ensure that it does not exceed the standard duration.

Second, further processing should be undertaken to remove excess moisture and prevent continued fermentation. Third, high-quality beans should be used to minimize the incidence of defects that can contribute to spoilage. Fourth, proper storage conditions should be maintained to prevent exposure to environmental factors that contribute to spoilage. Finally, adequate sanitation practices should be followed to prevent contamination by harmful microorganisms during processing.

It is essential to prioritize the reduction of spoilage risk during the honey processing method for Robusta coffee beans. Doing so can improve yield, enhance the quality of coffee, and lead to higher revenue generation. Furthermore, it can guarantee the safety and well-being of consumers. Therefore, producers should take the necessary steps to identify potential risks and implement measures to mitigate them effectively.


Summary of the process

The honey processing method for Robusta coffee beans is a relatively new technique that has gained popularity among coffee producers as a way to enhance the flavor profile of their beans. This method involves removing the skin of the coffee cherry, leaving the sticky mucilage intact. The beans are then dried with the mucilage still on, creating a natural fermentation process that yields a sweeter, fruitier flavor. Honey processed coffee beans are often referred to as “semi-washed,” as they fall somewhere between the fully washed and natural processing methods in terms of the amount of mucilage left on the beans.

One of the primary benefits of honey processing is that it can result in a more complex cup profile than traditional processing methods. The additional sugars and organic acids present in the mucilage can contribute to a range of flavor notes, from tropical fruits and berries to chocolate and caramel. This variation in flavor profile is particularly beneficial for Robusta beans, which are often used in blends, as it can add complexity to an otherwise straightforward coffee.

However, there are also some potential drawbacks to the honey processing method. The increased fermentation time can lead to greater risk of mold or off-flavors if not carefully monitored, and the sticky mucilage can be challenging to remove during the drying process. Additionally, the extra steps involved in honey processing can increase production costs, which may not be feasible for some farmers or exporters.

Despite these potential issues, the honey processing method has demonstrated significant potential for improving the quality of Robusta coffee beans. As interest in specialty coffee continues to grow, it is likely that more producers will explore this method as a way to differentiate their beans in a crowded marketplace. Further research into refining the honey processing technique, managing the fermentation process, and optimizing drying methods could help to mitigate some of the potential drawbacks and expand the use of this technique in the coffee industry.

Its implications

The honey processing method for Robusta coffee beans offers numerous implications for the coffee industry, including improved flavor profiles and increased sustainability. By using this method, coffee producers can create a unique and desirable product that stands out in a crowded market. Additionally, honey-processed Robusta beans have a reduced environmental impact compared to other processing methods, making the process more sustainable and eco-friendly.

The honey process involves leaving some of the sugary mucilage on the bean during processing, resulting in a sweeter and fruitier taste compared to traditional dry processing. This method can be optimized for different levels of sweetness by adjusting the amount of mucilage left on the beans, offering a wide range of flavor profiles. Furthermore, honey processing can have economic benefits for coffee producers. The higher demand and uniqueness associated with honey-processed beans can lead to higher prices and increased profitability for farmers.

Additionally, this method can contribute to the growth and development of the specialty coffee market, as consumers are willing to pay a premium for unique and high-quality products. Honey processing has the potential to revitalize the robusta industry, which has long been considered inferior to arabica beans due to a less desirable flavor profile. By using the honey processing method, robusta beans can achieve a unique and desirable flavor on par with arabica beans, ultimately enhancing the status of the robusta industry.

Future research in honey processing for Robusta coffee beans should focus on optimizing the process for different regions and cultivars. This includes determining the optimal amount of mucilage to leave on the beans for the desired flavor profile, as well as identifying the most suitable post-harvest treatment and drying methods. Additionally, research should be conducted on how honey processing affects the chemical composition of the beans and how this translates to flavor outcomes. This research can lead to a better understanding of the honey processing method, ultimately improving its implementation and profitability for coffee producers while also benefiting the environment and consumers.

Future Research

Future research on honey processing method for Robusta coffee beans is needed to further explore and optimize this technique. One area of future research could be focused on the influence of honey processing on coffee flavor and aroma. A study could be conducted to compare the sensory attributes of honey-processed Robusta coffee beans to traditionally processed beans. This could be done by conducting blind taste tests with trained panelists and using specialized equipment to measure the volatile compounds responsible for flavor and aroma.

Another area of investigation could be exploring the impact of honey processing on coffee bean morphology, physiology, and biochemistry. It would be interesting to see if there are any morphological or biochemical changes in the beans during honey processing, as well as how these changes may affect the brewing process or flavor profile. Additionally, more research is needed to optimize the honey processing method for Robusta coffee beans.

Factors that could be explored include honey concentration levels, fermentation times, and drying methods. This research could help coffee farmers and processors achieve higher quality, more consistent honey-processed Robusta coffee beans. By improving our understanding of honey processing method for Robusta coffee beans, we can create a more sustainable and profitable future for coffee producers and consumers worldwide.

Honey Processing Method for Robusta Coffee Beans – FAQs

1. What is honey processing method for Robusta coffee beans?

Honey processing is a method of coffee processing that involves removing the outer cherry skin from Robusta coffee beans while leaving some of the sticky fruit pulp (mucilage) intact on the bean.

2. How does honey processing affect the flavor profile of Robusta coffee beans?

Honey processing results in Robusta coffee beans with a sweeter, fruitier flavor profile and a lower acidity. The extent of the mucilage left on the bean affects the final flavor profile.

3. Are there different levels of honey processing?

Yes, there are different levels of honey processing. These range from white honey (least mucilage left on the bean) to yellow honey (moderate amount of mucilage left on the bean) to red honey (most mucilage left on the bean).

4. How long does honey processing take?

Honey processing typically takes several days to a few weeks. The amount of time depends on factors such as the amount of mucilage left on the bean, humidity, and temperature.

5. Is honey processing method environmentally friendly?

Honey processing is considered to be an environmentally friendly coffee processing method because it requires less water than other processing methods and produces less wastewater.

6. Are there any downsides to honey processing method?

One potential downside to honey processing is that it can be more labor-intensive and require more attention to detail than other processing methods. Additionally, if not done properly, it can result in defect flavors in the coffee.

Hanson Cheng

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