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
Matzo symbolizes redemption and freedom, but it is also "lechem oni", "poor man's bread". Thus it serves as a reminder to be humble, and to not forget what life was like in servitude. Also, leaven symbolizes corruption and pride as leaven "puffs up". Eating the "bread of affliction" is both a lesson in humility and an act that enhances the appreciation of freedom. Another explanation is that matzo has been used to replace the pesach, or the traditional Passover offering that was made before the destruction of the Temple. During the Seder the third time the matzo is eaten it is