The Building the Just Transitions in Food Systems Network is a SSHRC-funded community-led research collaboration  grounded in the resurgence of traditional food systems and Indigenous territorial governance. In partnership with three Tremembé communities, and anchored in long-standing collaboration with the Tremembé da Barra do Mundaú and supported by the NGO ADELCO, the project explores what just transitions can look like from the perspective of land-based communities resisting industrial expansion. Through participatory agroecological research, audiovisual storytelling, and intercultural dialogue, we are co-producing knowledge that supports climate resilience, cultural revitalization, and collective autonomy. This work is part of a broader effort to rethink sustainability transitions through local leadership, community-to-community learning, and relational accountability.