Tempeh

What is Tempeh?

Tempeh is a dense, solid cake made from cultured soybeans. Unlike tofu, which uses strained soy milk, tempeh retains the entire legume. A dense web of white fungal threads knits the softened beans together until individual grains are barely noticeable. It possesses a sturdy, chewy consistency and a savoury, earthy taste reminiscent of mushrooms or nuts. As it matures, this deep flavour grows more intense. In well-made blocks, the surface shows an even, pale coat, sometimes marked by harmless grey or black spore spots when exposed to extra air or cooler temperatures.

Where does Tempeh come from?

Historical records locate the earliest production in Bayat, Klaten, within Central Java, where people regularly ate it by around 1700. The food probably emerged by chance when stored legumes caught spores from wrappers made of teak or sea hibiscus foliage. Javanese diners had consumed local black soybeans since at least the twelfth century, creating tempeh well before imported white varieties became widespread. An alternate theory suggests it developed from leftover soy mash discarded during tofu making. Over time, imported pale beans replaced indigenous black crops across most Javanese kitchens.

How is Tempeh made?

Cleaned whole soybeans soak in water, lose their seed coats, and undergo partial boiling. Producers often introduce a mild acid like vinegar during soaking to keep the environment slightly acidic, which discourages bad microbes while helping beneficial mold thrive. Once cooled, the drained beans receive an inoculation of fungal starter, typically Rhizopus oligosporus or Rhizopus oryzae. Spread out into flat layers within perforated plastic or traditional leaves, the mixture ferments in warm conditions around thirty degrees Celsius for roughly one to two days. As the fungal network expands, it knits the loose beans into a solid, sliceable block.

How and when is Tempeh eaten?

Tempeh serves as a core everyday protein source across Java. Historically eaten plainly on its own, it has evolved into a versatile cooking foundation adapted for many separate dishes. Once harvested, fresh blocks spoil rapidly and require prompt chilling or freezing to stop the mold from continuing to grow. Good quality pieces stay intact when handled and give off a clean, gently sweet aroma. Cooks turn the firm slabs into various cooked preparations, enjoying its substantial bite and rich flavour alongside ordinary daily meals.

Kinds of Tempeh

Early forms relied strictly on native black soybeans, known as tempe dhele. Today, most producers use white or yellow soybeans, though specialty versions incorporate wheat, mixed grains, or different legume types. In cooler highland spots such as Malang, as well as Purwokerto, older methods using wild leaf starters fostered additional molds like Rhizopus arrhizus, creating a woollier white exterior and softer aroma than modern single-strain commercial starters produce.

What Tempeh means

Historically, tempeh was an essential everyday food of ordinary working people rather than royal courts. Early Javanese nobles rarely recorded it because it was not considered palace fare. Over centuries, mastering its fermentation became a cornerstone of domestic food culture across the island. Although long rooted in Indonesian households, its global presence has expanded rapidly in recent years, gaining traction in foreign markets as an unrefined, nutrient-dense source of plant-based protein.

Questions people ask about Tempeh

Good reading and sources

• ‘It’s actually a superfood!’ Why tempeh is suddenly on every menuThe Guardian, Article

• Tempeh on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data