https://www.shavei.org/blog/20....22/05/15/bread-of-se

Bread of Seven Heavens: A Sephardic Tradition for Shavuot - Shavei Israel

When the Jews left Iberia after the enactment of the Alhambra Decree, they took their language, traditions and culture with them. The Seven Heavens Bread was a special type of symbolic challah baked for Tikkun Leil Shavuot, the all-night Shavuot stud