The Seven Heavens Bread, Pan de Siete Cielos, is a traditional dairy-based yeast bread served only on Shavuot by the Sephardim. Like many medieval traditions, the origin of this bread is unknown. Seemingly this tradition has survived the Spanish Inquisition and the Nazi Holocaust. Today, thanks to the internet, it is gaining recognition and Jews are once more serving this wonderful bread.
Shavuot is technically the third festival listed in Leviticus 27. In the Torah it is called, the feast of harvest or the first fruits. In the New Testament it is called Pentecost. In the Postbiblical writings it called by multiple names i.e., feast of the Law giving, Atzeret Shel Pesach, or Zeman Mattan Toratenu.
Shavuot does not have a set date per se. Torah tells us to count fifty days after the Passover Shabbat. In the land of Israel, it is a one-day celebration. In the diaspora it is a two-day celebration.