Cooks traditionally mash the bananas smooth with a forked stick twirled between the palms, rather than a spoon or masher.
Green bananas are boiled until soft, then mashed together with beef, potatoes and a little milk into a thick, pale soup. Originating with the Chagga people on Kilimanjaro's slopes, it's become a common breakfast and celebration dish served in cafes across Arusha.