text: In eastern Europe, many Jews craft this substance into the shape of a bird or a ladder during Rosh Hashanah.
full_question: In eastern Europe, many Jews craft this substance into the shape of a bird or a ladder during Rosh Hashanah. In the Tashlikh ceremony, some Jews symbolically toss pieces of this substance into a river to cast off their sins. In the Torah, Sarah prepares this food for some visiting angels, and it miraculously does not spoil for seven days. Because of the haste of the Exodus from Egypt, Jews prepared an unleavened form of this food that is today eaten during Passover. For 10 points, name this food, traditional varieties of which include matza and challah.
first_sentence: In eastern Europe, many Jews craft this substance into the shape of a bird or a ladder during Rosh Hashanah.