Green beans roasted, ground and brewed in front of you, served in three rounds, over a couple of hours. Worth being straight about what this is: a social and hospitality ritual of real cultural depth, not a route to an altered state. It belongs here because the thing people are often actually looking for is ceremony, attention and unhurried company, and buna is all three.
The form is fixed. Grass is spread on the floor, incense is lit, green beans are washed and roasted in a pan and carried around so everyone can smell them, then ground and brewed in a clay jebena. Three rounds are poured, named abol, tona and baraka, and leaving before the third is a small rudeness.
It takes two to three hours and it is not designed to be efficient. That is the whole content of it. In Ethiopia and Eritrea it happens in homes, daily, and it is how neighbours check on each other.
There is no coffee ceremony retreat industry and you should be sceptical of anyone building one. If a Western retreat sells you a coffee ceremony as a transformational modality alongside cacao and sound healing, that is a repackage, and the people whose ritual it is are not in the transaction.
A representative shape drawn from how these are typically run. Use it as something to ask against, not as any one centre's timetable.