Coffee
Coffee originated in east Africa but spread across the world due to its energizing seeds.
#Human usage
People of the Fifth World, like people today, dry, roast, and grind the coffee plant seeds (colloquially called "beans") and combine them with boiling water to make stimulating beverages. Often, people sweeten their coffee with honey or sugar cane juice, or will add coconut milk, cocoa, or vanilla to it for a special treat. People sometimes cover whole coffee beans with chocolate, or mix ground coffee beans into balls of animal fat, for portable pick-me-ups on long journeys. People also use coffee grounds to flavor desserts, chili, and beer.
#Specialization
A community specializing in relationship with coffee will likely tend towards horticulture, and therefore live in settled villages. Often these communities will practice slash-and-burn agriculture, growing different guilds of plants at different stages and moving around the jungle in a regular cycle. They will likely plant coffee in a relatively late stage of this cycle, so it may enjoy the partial shade of a coconut or banana tree.
Because people must process coffee beans fairly extensively before making coffee from them, even a community tending more towards hunting and gathering will likely keep a "coffee camp" where they can stay for several days while they dry and roast the coffee beans.
Such a community will invariably have no trouble getting to sleep! They may place more emphasis than many communities on productivity and vigor. They may live in a place where, before collapse, coffee had great popularity and importance, such as Ethiopia.
The community may trade extensively with other communities that don't have their special relationship with coffee, but surely appreciate the energizing beverage. They may evince particular artistry in producing coffee-related accoutrements such as ceramic pots, mugs, tightly-woven coffee filters, and mortars and pestles, which they might also trade.
According to a (probably apocryphal) old story, a goat herder first discovered the energizing power of coffee beans when his goats ate the coffee cherries and began dancing wildly. A coffee-loving community in the Fifth World might remember this story and also have a close relationship with goats, maybe even adding goat milk to their coffee in remembrance of this momentous discovery.