Bongo'o
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Bongo'o (or Mbongo), also known as ebony sauce or black stew, is a dark colored stew of the Bassa people in Cameroon[1].

Its dark color is owed to a blend of spices that can include garlic tree powder, four corner spice, calabash nutmeg, country onions, njangsa seeds, and more[1][2].
It can be prepared with various proteins, e.g. Bongo'o Tjobi (or Mbongo Tchobi) reflects a version made with fish (Tjobi in Bassa).