tapai singkong — West Java, Indonesia

Tapai singkong is a fermented cassava preparation eaten as a sweet snack across much of Indonesia, made by letting cooked cassava sit under the action of a dry yeast starter until its starches break down into sugars and a light alcoholic tang develops. It is reported widely in West Java, where households and small producers wrap the fermenting pieces in banana leaves or set them in covered baskets, keeping them at room temperature away from direct light while the fermentation runs its course. To make it, peeled cassava is cut into pieces and steamed until just tender, then spread out to cool completely so the fermentation starter is not killed by residual heat. A thin layer of ragi powder is dusted over the pieces, which are then wrapped in banana leaf or covered in a basket and left undisturbed for two to three days in a warm spot until they turn soft, moist and faintly sweet-sour. What marks this West Javanese version is a texture that stays firm enough to hold its shape while turning glassy and moist at the core, with a smell and flavor closer to soft cheese or light wine than to plain cassava — the fermentation time is judged by touch and smell rather than a fixed clock, since a warmer kitchen shortens it and a cooler one draws it out.