Fermenting shea nuts using the traditional pit method yields better physicochemical properties with potential environmental benefits.

Shea oil, a globally consumed commodity, is intricately linked to the labor of women in Sub-Saharan Africa. This study examines local perceptions and adoption of a traditional shea nut fermentation method using subterranean pits in rural West African communities, and the chemical profiles of the kernels processed through different traditional methods. Key findings are that 1) local processors prefer the pit method due to its convenience and efficiency, and 2) lipid analyses indicate that fermenting shea nuts for three to six months results in an optimal chemical profile, characterized by lower free fatty acid (more than threefold) and polar lipid (more than 15-fold) content compared to boiled kernels. This enhances quality and mechanical processability, both criteria desirable for industrial applications. This study fills an important gap by chemically characterizing a traditional shea processing practice that has received little scientific attention. The results imply that the pit method holds potential for industrial shea oil extraction and for reducing firewood and water use in producing communities. However, this potential depends on fair benefit-sharing, local communities' willingness to adopt the new practice, and overcoming the challenges for scaling up.