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Tempeh

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Tempeh is a traditional Indonesian food made from fermented soybeans.

Tempeh (marketed) 3
Tempeh (marketed) 3

It is a staple source of protein on the island of Java. Unlike tofu, tempeh is a whole-soybean product. This means it retains the entire bean during production. Because of this, tempeh has a higher content of protein, dietary fiber, and vitamins. It is known for its firm texture and earthy flavor. This flavor becomes more pronounced as the product ages.

Sliced tempeh
Sliced tempeh

The production of tempeh relies on a controlled fermentation process. First, whole soybeans are soaked, dehulled, and partly cooked. During the soaking stage, some producers add vinegar to influence the final sensory qualities. The most important step is inoculation with a filamentous fungus. This fungus is known as Rhizopus spp. molds. Specifically, a starter containing Rhizopus oligosporus or Rhizopus oryzae is mixed into the beans. The beans are spread into a thin layer for fermentation. This process lasts between 24 and 36 hours at a temperature of approximately 30°C (86°F).

Membungkus Tempe
Membungkus Tempe

During fermentation, the soybeans must undergo specific environmental changes. The beans first cool down to allow for spore germination. This allows the mycelium, or a mat of white fungal threads, to grow abundantly. As the mold grows, the temperature of the beans rises naturally. Rapid mold growth occurs for about four hours. Eventually, the mycelium binds the soybeans into a solid, cohesive mass. A successful tempeh cake should be firm and compact. In good quality tempeh, the white mycelium permeates the entire cake so that the beans are barely visible.

Tempe Daun jati
Tempe Daun jati

Maintaining the correct environment is vital to prevent spoilage. Producers must manage oxygen, humidity, temperature, and pH levels. The pH level should be kept between 3 and 5. To achieve this, a mild acidulant like vinegar, lactic acid, or acetic acid is often added. This acidity favors the Rhizopus mold while restricting undesirable microorganisms. While oxygen is required for growth, it must be kept at low levels. If the temperature is too low or ventilation is too high, gray or black patches of spores may form. This process, called sporulation, is a normal sign of mature tempeh.

Tempeh 001
Tempeh 001

Historical evidence suggests tempeh originated in Indonesia, specifically in Bayat, Klaten, in Central Java. It was commonly consumed around the year 1700. The invention may have been a serendipitous event. It likely occurred when stored soybeans were exposed to fungi found on teakwood or sea hibiscus leaves. Traditionally, Hibiscus tiliaceus leaves were used as wraps. The underside of these leaves contains trichomes, or tiny hairs, where the Rhizopus fungus lives in the wild.

Tempe Daun jati
Tempe Daun jati

Originally, tempeh was made from native black soybeans (Glycine soja). Later, the industry shifted to using imported white or yellow soybeans (Glycine max).

There is ongoing scholarly debate regarding the exact origins of tempeh. Food historian Murdijati Gardjito argues that tempeh was created by native Javanese people. She suggests its preparation predates the arrival of Chinese-style tofu. However, historian Ong Hok Ham suggests tempeh might be a byproduct of tofu production. This is known as the "Okara-Tempe Hypothesis." It proposes that discarded tofu residue, or okara, was naturally fermented before being adapted to whole soybeans. Regardless of its start, tempeh has become a massive global industry. In the United Kingdom, one brand's annual sales increased by 736% in 2025. In North America, the market is expected to reach $1519.8 million by 2030.

Tempe Burger
Tempe Burger

Tempeh is highly versatile in modern cooking and can be found in many forms. It can be used in stir-fries, such as the Indonesian dish osengan.

Sautéed Tempeh cropped
Sautéed Tempeh cropped

It is also popular as a meat substitute in items like tempeh burgers.

Tempe Burger
Tempe Burger

Because it is a perishable food, proper packaging is essential. Food-grade wrapping paper or perforated polyethylene bags help maintain quality. These materials provide the necessary oxygen supply for the living culture. Once produced, tempeh must be refrigerated or frozen immediately to prevent overheating and spoilage. This careful management ensures the tempeh remains a nutritious and delicious staple.

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🖼️ Images & Media (13)
File:Tempeh (marketed) 3.jpg
Tempeh (marketed) 3.jpg
File:COLLECTIE TROPENMUSEUM Verkoop van tempeh-koeken Java TMnr 10013113.jpg
COLLECTIE TROPENMUSEUM Verkoop van...
File:Membungkus Tempe.jpg
Membungkus Tempe.jpg
File:Tempeh 001.jpg
Tempeh 001.jpg
File:Tempe Burger.jpg
Tempe Burger.jpg
File:Sliced tempeh.jpg
Sliced tempeh.jpg
File:Sayur lodeh.JPG
Sayur lodeh.JPG
File:Tempe gembus 160130-0337 rwk.JPG
Tempe gembus 160130-0337 rwk.JPG
File:Tempe Daun jati.JPG
Tempe Daun jati.JPG
File:Menjes kacang Malang.JPG
Menjes kacang Malang.JPG
File:Sautéed Tempeh cropped.jpg
Sautéed Tempeh cropped.jpg
File:Tempe mendoan.JPG
Tempe mendoan.JPG

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