What happens when an ordinary garlic bulb is given time, warmth, and carefully controlled humidity? It slowly transforms into black garlic, an intriguing ingredient that has been gaining attention among chefs, food lovers, and health-conscious consumers around the world. At first glance, its jet-black cloves may look unusual, but behind that striking appearance is a fascinating transformation.
It is an exclusive ingredient known for its rich flavour, dark colour, and soft texture. But how does ordinary garlic become this special delicacy? The answer lies in its ageing process.
In this guide, we'll take you through how black garlic is made step by step—from selecting fresh garlic and controlling temperature and humidity to understanding the science behind its dark color, distinctive flavor, and soft texture.
How Black Garlic Is Made?
The black garlic process starts with fresh, whole garlic bulbs. Producers generally start with whole, healthy garlic bulbs that are firm, clean, and free from visible mould, damage, or spoilage. The bulbs are kept intact during processing rather than separating the individual cloves.
The quality and characteristics of fresh garlic can influence the final black garlic. Factors such as garlic variety, moisture content, bulb size, and initial condition can affect the way the cloves respond to the aging process.
After that bulbs are placed in a controlled environment where temperature and humidity can be maintained for an extended period.
There is no single standard method for producing black garlic. Producers use different combinations of temperature, humidity, and aging time depending on the garlic variety, equipment, and desired final characteristics. Some commonly studied approaches include:
70°C with around 80% relative humidity for approximately 30 days
60–70°C with 85–95% relative humidity for around 40 days
70°C with 90% relative humidity for around 30 days
Other studies have used temperatures from 50°C to 90°C and processing periods ranging from roughly 10 to 60 days.
Conditions around 75–80°C are frequently reported as favorable for developing desirable color, flavor, and texture.
The Aging Process
The main idea behind how black garlic is made is simple: garlic is aged slowly under controlled conditions.
Whole garlic bulbs are placed in an enclosed environment where temperature and humidity can be carefully managed. The garlic remains there for several weeks, depending on the desired characteristics and the production method.
During this period, several natural chemical reactions occur. One of the most important is the Maillard reaction, a group of reactions between sugars and amino compounds that can produce darker colours and new flavours when food is exposed to heat over time.
As aging continues, the garlic gradually changes:
White cloves become brown and eventually black.
The strong, sharp garlic flavour becomes milder.
A naturally sweet and savoury flavour develops.
The cloves become softer and more tender.
The aroma changes from pungent and fresh to deeper and more complex.
This slow transformation is what gives aged garlic its distinctive character.
Temperature & Humidity
Temperature and humidity are two of the most important factors in the black garlic process.
The garlic needs a warm, humid environment for an extended period. However, simply applying high heat is not enough. Conditions need to remain reasonably stable throughout the aging process. The exact conditions can vary depending on the production method, but research has used temperatures ranging from about 75°C to 80°C, along with controlled humidity.
This is why we at Food & Faith use controlled chambers or specialized equipment. Consistent conditions make it easier to produce black garlic with a predictable colour, texture, flavour, and shelf life.
Is It Fermented?
One common question about black garlic is whether black garlic fermentation is responsible for its transformation.
Black garlic is often described as “fermented garlic,” but the black garlic process is not necessarily fermentation in the traditional sense. Traditional fermentation usually involves microorganisms such as bacteria or yeast converting sugars into other compounds.
In black garlic production, the major transformation is generally associated with controlled heat, humidity, aging, and chemical reactions such as the Maillard reaction.
The term “fermentation” is still widely used when discussing black garlic because the product undergoes a long-controlled transformation that resembles some aspects of fermented foods. However, black garlic does not need to rely on the same microbial fermentation process used to make foods such as yogurt, kimchi, or sauerkraut.
Why It Turns Black?
So, how black garlic turns black is one of the most interesting parts of the process.
Fresh garlic contains naturally occurring sugars and amino compounds. During prolonged exposure to controlled warmth and moisture, these compounds participate in non-enzymatic browning reactions. The Maillard reaction plays an important role in developing the dark colour and complex flavour associated with black garlic. Other changes also take place as the garlic ages. Caramelization, phenolic oxidation, and the breakdown of carbohydrates and sulfur compounds also contribute to distinctive taste, texture, and appearance of black garlic.
Over time, the cloves become progressively darker until they reach the deep brown or black colour that gives black garlic its name. The transformation also changes the taste. Instead of the strong heat and sharpness associated with raw garlic, aged garlic can have a softer, sweeter, tangy, and savoury flavour.
Commercial vs Home Production
Making black garlic is a slow process where time, temperature, and humidity all play an important role in determining the final quality. While it is possible to make black garlic at home, commercial production allows for much greater control over these conditions.
At Food & Faith, we use dedicated ageing chambers designed to maintain stable environmental conditions over the extended period required to produce black garlic. Careful monitoring of temperature and humidity helps ensure that garlic undergoes a consistent transformation, resulting in the desired color, softness, sweetness, and depth of flavor. Controlled production also allows us to process larger quantities while maintaining consistency across batches.
Home production, on the other hand, may be carried out using specialized black garlic makers, rice cookers, slow cookers, or other equipment capable of maintaining warm conditions for an extended period. However, household appliances may not provide the same level of precise humidity and temperature control. Even small variations in these conditions can influence the final texture, flavor, moisture content, and overall quality of the garlic.
Quality Factors
Several factors can influence the quality of the aged garlic.
Garlic quality: Fresh, healthy bulbs generally provide a better starting point.
Temperature: Consistent heat helps maintain a predictable aging process.
Humidity: Adequate moisture is important for developing the desired soft texture.
Aging time: Black garlic needs sufficient time to develop its characteristic colour and flavour. Rushing the process can lead to inconsistent results.
Uniform conditions: If different bulbs experience different conditions, the final batch may have variations in colour, texture, and flavour.
A high-quality product should have a deep, even colour, a soft texture, and a pleasant sweet-savoury flavour without signs of spoilage.
Safety & Storage
Food safety should always be considered when producing or purchasing black garlic.
During production, cleanliness and controlled conditions are important. Garlic should be protected from unwanted contamination, and any bulbs showing mould, unusual spoilage, or an unpleasant rotten smell should not be consumed.
Once produced, black garlic should be stored according to the manufacturer's recommendations. Commercial products may have specific storage instructions based on their processing and packaging methods.
If you make black garlic at home, avoid assuming that a homemade product has the same shelf life as commercially produced black garlic. Proper processing, cooling, packaging, and storage all affect safety and quality.
When buying packaged black garlic, checking the label for storage instructions and a best-before or use-by date is a simple way to make an informed choice.
Frequently Asked Questions (FAQs)
Q1. How long does it take to make black garlic?
Making black garlic typically takes 3–6 weeks, depending on the temperature, humidity, garlic variety, and desired texture and flavor.
Q2. Is black garlic the same as roasted garlic?
No. Roasted garlic is cooked for a relatively short period, while black garlic undergoes a much longer controlled aging process. The flavour, colour, and texture is therefore quite different.
Q3. Does black garlic taste like regular garlic?
Not exactly. The sharpness of fresh garlic is significantly reduced. Black garlic is generally softer, sweeter, and more savoury, with a rich and complex flavour.
Q4. Can black garlic be made at home?
Yes, some people make it using dedicated black garlic makers or other suitable equipment. However, maintaining consistent temperature, humidity, cleanliness, and safe storage is important.
Learn About Food & Faith Black Garlic
At Food & Faith, we bring this unique ingredient to your table with carefully selected black cloves that are made to add depth, richness, and a touch of natural sweetness to your meals. Whether you’re discovering black garlic for the first time or already love its unique flavour, our black cloves are an easy way to explore the world of aged garlic.
Explore Food & Faith Black Garlic today and bring the goodness of aged garlic to your kitchen.
