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 contains an instruction to eat matzo, specifically, on the first night of Passover and to eat only unleavened bread (in practice, matzo) during the entire week of Passover. Consequently, the eating of matzo figures prominently in the Passover Seder. There are several explanations for this. The Torah says that it is because the Hebrews left Egypt with such haste that there was no time to allow baked bread to rise; thus flat, unleavened bread, matzo, is a reminder of the rapid departure of the Exodus. Other scholars teach that in the time of the Exodus, matzo was commonly baked for