The term SEDER CRACKER is used to refer to a matzo, which is a type of unleavened flatbread that is traditionally eaten by Jews during the Passover Seder. Matzo is made from flour and water and is usually square or rectangular in shape. It is often served with butter or margarine, as well as other accompaniments such as honey or jam. The term SEDER CRACKER is derived from the fact that matzo can be broken into pieces, resembling a cracker.