In recent years there has been a growing interest in collaborative and collective practices across and beyond the arts. But what does it actually mean to work collectively? During a series of public happenings based around collectivity and being together, diverse self-organised collectives actively explored this question at Roodkapje, a laboratory for ART x LIVE x FOOD in Rotterdam, The Netherlands. Through cooking, eating, and digesting together, questions were raised around what it means to be (or not to be) a citizen in a larger community; how to radically experiment with distribution of power in existing hierarchies; how to find ways of collective self-determination in inhospitable systems; and how to build collectivity with more than human collaborators. Cooking Up Collectivity collects the recipes, questions, drawings, methods, menus, conversations, and other experimental outputs from this programme to encourage readers to build their own collectives and to self-organise.