Banana
The term banana refers to a variety of long, starchy fruits produced by plants in the genus Musa. Native to South Asia, Southeast Asia, and Australia, these plants spread across the tropics during the Fourth World. Shortly before the collapse, a particular sweet variety called the Cavendish came to dominate above all others.
However, during and after the collapse, as the planet warmed and many people tried to spread sustainable tropical horticultural practices into newly-tropical regions, a more diverse selection of bananas spread across the globe. These include both soft dessert bananas similar to the old Cavendish variety, firmer cooking bananas (often referred to as "plantains"), and undomesticated varieties. Different kinds of bananas vary in taste and texture and can appear yellow, green, brown, or even pink.
People of the Fifth World enjoy dessert bananas raw, as one would any raw fruit. They also use the trees for fiber, use the leaves to eat on or to wrap meat in, and ferment the fruits to make banana wine or (if adding a grain for yeast) banana beer.
A community that specializes in relationship with bananas will invariably tend towards horticulture, and therefore live in settled villages. They will likely practice slash-and-burn agriculture, growing different guilds of plants at different stages and moving around the jungle in a regular cycle. They will typically grow banana trees at a relatively late stage in this cycle, planting them in traditional "banana circles" with cassava or manioc; vetiver, lemongrass, or citronella; sweet potato; and taro.