Matzo must be ground from one of the five grains specified in Jewish law for Passover matzo: wheat, barley, spelt, rye or oat. Per Ashkenazic tradition, matzo made with wine, fruit juice, onion, garlic, etc., is not acceptable for use at any time during the Passover festival except by the elderly or unwell. Matzo dough is quickly mixed and rolled out without an autolyse step as used for leavened breads. Most forms are pricked with a fork or a similar tool to keep the finished product from puffing up, and the resulting flat piece of dough is cooked at high temperature
Passover is eaten, for which reason Passover is called the feast of unleavened bread in the Torah. Thus "matzo" (flat unleavened bread) is eaten during Passover and it is a tradition of the holiday. Historically, together with Shavuot and Sukkot, Passover is one of the Three Pilgrimage Festivals ("Shalosh Regalim") during which the entire population of the kingdom of Judah made a pilgrimage to the Temple in Jerusalem. Samaritans still make this pilgrimage to Mount Gerizim, but only men participate in public worship. The Passover begins on the 15th day of the month of Nisan, which typically falls in March or