Mtori is made with green cooking bananas rather than sweet ripe ones, which is why the soup is savory and starchy instead of sweet.
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.