ALSO KNOWN AS MATZO or matza, matzah is unleavened bread traditionally eaten by members of the Jewish faith during Passover, the celebration of the liberation of Israelites from Egypt. The Bible states that the Israelites left Egypt so abruptly, they did not have time to wait for their bread to rise. Thus, Matzah today is made solely from flour and water, which causes it to remain flat. During Passover, also known as Chag HaMatzot (the holiday of matzos), the flour must be made from any of the five grains mentioned in the Torah: wheat, barley, rye, spelt and oats. At Passover seder, the ritual storytelling of the Exodus, there is typically a stack of three wafers on the table. Two represent the food gathered by Israelites before the Exodus and one is broken in the beginning of the seder to symbolize lekhem oni (the bread of affliction). The custom of shmurah (watched) matzah is the watching of the ingredients from harvest to consumption to ensure there has been no fermentation of the flour.