In Japan, where there is a bias toward English-only in foreign language education, there are also grassroots efforts to introduce greater plurality in the classroom. However, introducing diverse languages and cultures into the classroom can lead to folklorization, the delivering of essentialized information in pre-packaged formats, which can potentially delegitimize other languages and cultures. This contribution examines a collaborative integrative plurilingual STEAM practice at an elementary school in Western Japan. In the ‘school lunches project,' the children experience various international cuisine, leading up to which they would engage with related languages and cultures through collaboratively produced plurilingual videos and museum-like exhibits of cultural artifacts. The interdisciplinary, hands-on, experiential learning within this project helped the children to develop an investigative stance toward linguistic and cultural artifacts, nurture a deeper awareness of languages and openness to diversity, foster reflexivity, and encourage interdisciplinary engagement.