Locals sometimes nickname it "face the wall" — a joke about how filling and dense the dark grey dumpling is, dense enough to leave you slumped after a full portion.
Cassava chips are sun-dried, then pounded into a coarse flour that's stirred into boiling water until it forms a smooth, grey-brown dough. It's served in a bowl with a soup — light soup, palm-nut, or groundnut — same as fufu.