Deep in the mountains of northwestern Greece, the Jewish community of Ioannina preserved a unique religious identity dating to the eighth century CE - one frequently misclassified as Sephardic despite predating the Iberian exodus by centuries. Through ethnographic documentation combining personal testimony, historical records, and Judeo-Greek liturgical texts, this research reconstructs the community's yearly religious cycle before its near-destruction in the Holocaust. The findings reveal distinctive variations from both Ashkenazi and Sephardic traditions: Greek vernacular hymns written in Hebrew characters, fresh fava beans during Pesach, and the singular Hyrtame celebration on Rosh Hodesh Adar. Detailed documentation captures specific ritual elements like the ornate candila decorations for Yom Kippur and locally-composed pizmonim, demonstrating how this community maintained its indigenous practices despite pressure from larger Sephardic populations. Of 1,850 Jews living in Ioannina in 1939, only sixty survived the Holocaust, lending urgent significance to this preservation of their endangered cultural practices. The research both enriches our understanding of Mediterranean Jewish diversity and challenges simplified classifications of Jewish communities, while preserving the memory of a nearly extinct tradition.