Fermentation starts in the container tied to the cut bamboo shoot, so the sap collected in the morning is often already mildly alcoholic before it reaches the seller.
Sap tapped from young bamboo shoots during the rainy season ferments naturally within hours into a sweet, faintly fizzy, low-alcohol wine reminiscent of sparkling cider. It's sold in local bars and roadside stalls across Tanzania's Southern Highlands, including around Mbeya, often straight from the collection container.