Quinine tree bark is sometimes stirred into the fermenting brew, a traditional touch believed to add bitterness and help preserve it.
Ripe bananas are mashed and fermented, then combined with sprouted, sun-dried finger millet for a second fermentation that gives the drink its cloudy look and tangy, mildly alcoholic kick. Traditionally brewed by Chagga families around Kilimanjaro and served communally, it's also become a popular drink in Arusha's bars.