"How does a cacao bean become chocolate?"—Before the whitish raw beans taken from the fruit transform into the brown chocolate we know, they pass through several processing steps. Fermentation, drying, sorting, roasting, grinding, mixing, conching, tempering, molding—each step has its own specific temperature, time, and technique, and if any is done poorly, the flavor and texture are greatly affected.
In this article, from the perspective of Minoyo, which has handled Kyoto confectionery raw materials for 120 years, we explain the cacao bean processing steps in three stages: "primary processing at the growing region," "secondary processing at the factory," and "chocolate finishing steps." We have summarized the key points that professionals should grasp—including the differences between cacao nibs, cacao mass, cocoa butter, and cocoa powder, the mechanism of tempering, and points of quality control.
From Cacao Bean to Chocolate: An Overview of the Processing Steps
First, let's grasp the overall picture of the processing steps. Before cacao beans become chocolate, different treatments are carried out in two locations: the harvest area and the factory.
| Stage | Location | Main Steps | Purpose |
|---|---|---|---|
| Primary Processing | Growing Region | Harvest → pulp removal → fermentation → drying | Create the foundation of flavor and reduce moisture |
| Secondary Processing | Factory | Sorting → roasting → grinding → separation | Produce cacao nibs, cacao mass, and cocoa butter |
| Finishing | Factory | Mixing → conching → tempering → molding | Completed as chocolate |
It is said that 70–80% of a cacao bean's flavor is determined in primary processing (fermentation and drying), and the steps from secondary processing onward serve to draw out and refine that flavor. The reason people say "you need good cacao beans to make delicious chocolate" is that the quality of this fermentation stage cannot be recovered in later steps.
Primary Processing at the Growing Region: Fermentation and Drying Determine the Flavor
The raw beans taken from the cacao fruit (pod) first undergo fermentation and drying at the growing region. This primary processing is the starting point that creates the base flavor of chocolate.
Harvesting and Pulp Removal
Cacao fruit is harvested twice a year. Ripe pods are cut from the branches, split open with a machete, and the raw beans inside are removed. One pod contains 40–50 raw beans, wrapped in white pulp. At this point, the raw beans are a pale brown and have no chocolate aroma at all.
Fermentation: The 5–7 Days That Create the Core of Flavor
The removed raw beans, still in their pulp, are placed in wooden boxes or covered with banana leaves and fermented over 5–7 days. Yeast, lactic acid bacteria, and acetic acid bacteria break down the sugars in the pulp, and as the temperature rises to 40–50°C, precursors specific to chocolate (compounds that become the basis of flavor) are generated inside the raw beans.
If fermentation is insufficient, grassy notes and astringency remain in the finished product. Conversely, if fermentation lasts too long, acetic or putrid odors appear. Fermentation methods (wooden-box, heap, banana-leaf, etc.) differ by region, and these appear directly as the individuality of the cacao. The quality of fermentation management is the greatest difference between fine cacao (premium cacao) and mass-produced cacao.
Drying: Reducing Moisture to Below 10%
After fermentation, the raw beans are dried by sunlight or machine over 1–2 weeks, reducing moisture to about 7–8% (the international trade standard; above 10%, the risk of mold and spoilage rises). Because drying too fast or too slow affects flavor, temperature control and time allocation directly determine quality. Only once drying is complete are the beans in a state that can be shipped to the international market as "cacao beans."
Secondary Processing at the Factory: Sorting, Roasting, and Grinding
Exported cacao beans enter secondary processing at chocolate factories around the world. Through the three steps of sorting, roasting, and grinding, cacao beans are transformed into an intermediate material called "cacao nibs."
Sorting and Foreign-Matter Removal
Cacao beans arriving at the factory are first sorted by size, weight, and shape, and foreign matter such as stones, metal fragments, and fiber debris is removed. Optical sorters and magnet-based removal devices are used, and thorough sorting is carried out so as not to damage machinery in the later roasting and grinding steps. Because uneven particle size causes uneven roasting, this is work that directly affects quality.
Roasting: 120–140°C for 20–40 Minutes
The sorted cacao beans are roasted at 120–140°C for 20–40 minutes. Relatively low-temperature, long-duration roasting is standard—milder conditions than for coffee beans (180–250°C for 10–20 minutes). During roasting, the Maillard reaction between sugars and amino acids and the caramelization of sugars proceed, giving rise to the "chocolate-specific aroma" that did not exist at the raw-bean stage.
Changing the roasting temperature by just 10°C greatly alters the final chocolate's flavor. Dark roasting increases bitterness and richness, while light roasting leaves a fruity acidity and delicate aroma. Designing a roasting profile to match the product's intended direction is one of the differentiating factors of bean-to-bar chocolate.
Grinding Into Cacao Nibs
After roasting, the outer husk is removed from the cacao beans and the interior is coarsely crushed. This coarsely crushed material is "cacao nibs." Cacao nibs are pure cacao with no sugar added, used as a confectionery ingredient in granola, cookies, ganache decoration, and more. The particle size varies by manufacturer, and you can choose from coarse types around 5mm to fine types of 2mm or less.
Producing Cacao Mass, Cocoa Butter, and Cocoa Powder
By further processing cacao nibs, three ingredients familiar on the confectionery floor—cacao mass, cocoa butter, and cocoa powder—are produced. Let's organize the differences and uses of each.
Cacao Mass: A Paste of Ground Nibs
Grinding cacao nibs into a smooth paste produces "cacao mass (cacao liquor)." The fat (cocoa butter) contained in the cacao beans melts from frictional heat, becoming a flowing liquid. When cooled, it hardens and becomes the prototype of what we call dark chocolate. Set without added sugar, it is sold as "100% cacao chocolate."
Cocoa Butter: The Fat Pressed Out of Cacao Mass
When cacao mass is pressed under high pressure, the fat "cocoa butter," which accounts for about half its weight, separates out. Cocoa butter has a distinctive melting characteristic—solid at room temperature and melting at body temperature (around 36°C)—and is the ingredient that gives chocolate its smooth melt-in-the-mouth quality and gloss. It is also used as a raw material for cosmetics and lip balm.
Cocoa Powder: Grinding the Defatted Solids
Grinding the remaining solids (cacao cake) after cocoa butter has been pressed out produces "cocoa powder." The fat content drops to about 10–25%, becoming a smooth powder. It is widely used as a flavor ingredient for cocoa drinks, baked goods, and confectionery. Alkalized (Dutch-process) treatment deepens the color and reduces acidity, and it is used alongside the natural process for different purposes.
The Finishing Steps to Complete Chocolate
Cacao mass is mixed with sugar, cocoa butter, and dairy ingredients (in the case of milk chocolate), and enters the finishing steps that bring out smoothness and gloss. Conching and tempering are the final steps that determine chocolate quality.
Conching: Kneading That Refines Flavor and Texture
"Conching" is the step of continuously kneading the mixed chocolate ingredients for a long time while applying heat. Kneading time ranges from a few hours at the shortest to over 72 hours at the longest. In this step, the particles become fine (10–30 micrometers or less), volatile acidic components are driven off, and a smooth mouthfeel and mellow flavor are produced. The length of conching is a design variable that determines each chocolate manufacturer's individuality.
Tempering: Temperature Adjustment to Stabilize the Crystal Structure
"Tempering" is the temperature-adjustment step to stabilize the crystal structure of cocoa butter. The chocolate is melted once and raised to around 45°C, then lowered to 27°C, then returned to 30–32°C—passing through a three-stage temperature profile. This forms the stable form-V crystal among the six types of cocoa butter crystals, achieving a glossy sheen, a crisp snap, and a good melt in the mouth.
If tempering is done poorly, a white powder (fat bloom) can appear on the surface, or the melt in the mouth can become poor. It is a step where handmade chocolate often fails, but in commercial production it is automatically controlled by a tempering machine.
Molding and Cooling
The tempered chocolate is poured into molds and lightly vibrated to remove air bubbles. It is cooled to around 18°C in a cooling tunnel, and once hardened, it is removed from the mold and complete. After molding, it is wrapped and packaged and delivered to consumers.
Quality Control and Safety Standards in Cacao Bean Processing
Because cacao bean processing handles a naturally derived material, quality control and safety standards are set strictly. Confectionery manufacturers should confirm their suppliers' management systems in advance.
Checking for Mycotoxins and Pesticide Residues
Cacao beans carry the risk of ochratoxin A (a type of mycotoxin) being generated by mold during storage. In major markets such as the EU, limit values are set, and inspections are carried out on import. Pesticide residues are also subject to checks, and when selecting a reliable supplier, confirming reports from third-party inspection agencies is standard practice.
Managing Cadmium Content
Cacao beans can contain cadmium absorbed by the plant from the cultivation soil. In the EU, cadmium limits were tightened from 2019, and in some regions, lots exceeding the limit have been halted from distribution. Central and South American origins (especially Ecuador and Peru) are said to have relatively high cadmium content, so for commercial lots, confirming inspection values by origin is necessary.
The Importance of Traceability
Traceability from a cacao bean's origin to the processing factory is emphasized not only for quality control but also from the standpoints of sustainable sourcing, fair-trade certification, and combating child labor. As the EU Deforestation Regulation (EUDR) and various countries' sustainability regulations are strengthened, choosing a supplier whose history—from producer to final product—is visible is essential from the standpoint of brand protection.
Roasting Technique Transforms the Character of a Raw Material: Minoyo's Soybean Roasting Story
"Roasting," at the heart of the cacao bean processing steps, is the technique that defines a raw material's character. Kyoto's Minoyo applies the roasting techniques it has cultivated over 120 years of making kinako to creating new, cacao-free materials as well.
120 Years of Soybean Roasting Know-How
Minoyo was founded in 1902 (Meiji 35) and is a long-established company that has handled Kyoto confectionery raw materials for 120 years. By roasting the domestic soybeans that are the main ingredient of kinako every day, and adjusting the heat according to variety, origin, humidity, and temperature, we have drawn out fragrance and umami.Soybean Roasterywe handle everything under an integrated system, from cultivation to roasting, grinding, and packaging.
Roasting Technique Creates Cacao Alternatives
Cacao beans, coffee beans, and soybeans all share the point that roasting gives rise to aroma, color, and flavor. At Minoyo, we are pursuing an effort to fashion the roasting residue left over when roasting soybean coffee into a cacao alternative, "Japanese cacao." By adjusting the roast level, particle size, and blend for each bag, this is an approach that draws out a fragrance and deep color close to cacao.
As a Hedge Against Raw-Material Sourcing Risk
For a confectionery industry facing ballooning material costs due to the cacao shock, a domestic upcycled material that uses roasting technique to draw a similar flavor from a different bean is an option that simultaneously supports cost, domestic production, and sustainability. Please feel free to inquire fromContactormaterial downloadfor sample trials and small-lot consultations. Our overall efforts across the business are covered atOur Business & Why We Are Chosen, and the ordering process is summarized atOrdering Process & How to Order.
Frequently asked questions
Q1. What is the difference between cacao nibs and cacao mass?
Cacao nibs are simply roasted cacao beans that have been coarsely crushed, while cacao mass is cacao nibs further ground into a paste. Cacao nibs are used where a granular texture is desired (granola, cookies), and cacao mass where smoothness is needed (chocolate, ganache).
Q2. Why is tempering necessary?
Cocoa butter has six crystal forms, and unless the stable form-V crystal is formed, problems occur such as the surface turning white (fat bloom), poor melt in the mouth, and loss of gloss. Tempering is temperature-profile control to selectively create the form-V crystal, and in commercial production it is generally handled by an automatic machine.
Q3. Can a poor fermentation step be recovered later?
It cannot be recovered. Because there are limits to correcting it in later roasting or conching, the basic principle is to source from regions and suppliers that carry out reliable fermentation management.
Q4. Are cocoa butter and cacao butter different things?
They are the same thing. In Japan it is often written as "cocoa butter," while overseas it is called "cacao butter." It is the fat extracted from cacao beans, with a distinctive melting characteristic—solid at room temperature, melting at body temperature—and it is the ingredient that supports chocolate's melt in the mouth.
Q5. Is it possible to process cacao beans domestically?
Roasting, grinding, and turning imported cacao beans into chocolate at domestic factories is commonly done. On the other hand, growing cacao itself domestically is at the experimental stage in Okinawa and the Ogasawara Islands. It is not at a commercial distribution level, so for the time being, the realistic options for domestic production are either processing imported beans domestically or substituting with soybean-based upcycled materials.
Summary: Understanding the Processing Steps Improves the Precision of Ingredient Selection
The cacao bean processing steps consist of three stages: fermentation and drying at the growing region (primary processing), sorting, roasting, and grinding at the factory (secondary processing), and conching, tempering, and molding (finishing). The core of the flavor is created in primary processing, and the subsequent steps follow a flow of drawing out and refining that flavor.
For a confectionery manufacturer's purchasing staff, understanding the meaning of each step improves the precision of supplier selection, sample evaluation, and formulation design. In a period of rising cacao prices, the option of using domestic upcycled materials that leverage roasting technique alongside cacao is also expanding.ContactWe accept inquiries about sample consultations and material design from
References and sources
- Cacao bean processing steps and international standards:ICCO (International Cocoa Organization)
- Cadmium regulations (EU limit values):EUR-Lex (EU legal database)
- Vietnamese coffee (as a comparison for roasting):Vietnam Gift
- Origin risk for cacao beans:Minoyo blog "Where are cacao beans grown? The reasons for West Africa's concentration and the current state of domestic production"
- Comparison of roasting processes:Minoyo blog "The Difference Between Cacao Beans and Coffee Beans"
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