This coming Shabbat is sometimes called Shlissel or Key Shabbat. The first Shabbat after Passover there is a custom to bake the Challah into the shape of a key, or, some wrap a key in silver foil and bake it in the Challah (it’s fun to find, but be careful not to bite into it!). Some sprinkle poppy seeds on the loaves to remind us of the manna that began to fall in the desert after the Jewish nation left Egypt. The manna began falling in the Hebrew month of Iyar which is the Hebrew month which comes after Passover.