In light of societal pluralism, diverse visions exist for social justice. In this sense, uncertainty is a marker of social justice education and research. This article shares insights into how we came to ask a question about teaching for social justice through cross-cultural collaborative self-study. Eight New Zealand pre-service teachers participated in semi-structured interviews in which they reflected on their six-week social studies methods course. Drawing on pedagogical moments that the pre-service teachers saw as being significant, this article explores the generative and ambiguous ways in which the course 'muddied the waters' of their unfolding conceptions and practices of social justice education. The article describes how coming to know 'teaching for social justice' through the eyes of these pre-service teachers provided a reflexive surface for our self-study and has shaped its trajectory. In contrast to our initial desire for greater certainty, placing the uncertainties of social justice at the forefront of our practice has become central to our inquiry.