In many parts of the world, people are coming together to experiment with ways to collectively take care of their livelihoods and create practical solutions to their needs. Guided by principles of solidarity, these grassroots initiatives represent rich contexts for research on the urban commons: what qualifies them as commons, and how do they emerge, develop, sustain and dissolve – or transform over time? This research dissects the commons character of a food network which emerged from Porto's solidarity economy movement in a post-crisis context. Following an action-research approach and methodological triangulation, we develop a qualitative analysis of a “prosumers” group, where both production and distribution were performed weekly by consumers themselves. We first analyze how the initiative emerged and then look at how its principles and democratic qualities relate to commons theories and frameworks. We then delve into the main dilemmas of its commoning practices and reflect about its transformative character and liminal role as a temporary urban commons. Despite ceasing its activities, there was a lived-experience and a knowledge commons which allowed it to be appropriated in new terms, and thus food networks as urban commons persist.