Fermentation starts almost as soon as the sap leaves the tree, so matango a few hours old is already mildly alcoholic, and by the next day it is noticeably stronger and sourer.
Matango is tapped as fresh, sweet sap from palm trees, collected in gourds or bottles, and left to ferment naturally, growing stronger and more sour the longer it sits. It's sold fresh at roadside stands and local bars across Cameroon, especially along the coast.