We make a sandwich from 2 pieces of matza and a piece or maror as was done on Passover during the time of the Temple in Jerusalem. Some also put charoset in the sandwich. The charoset, a mixture of fruit and nuts chopped fine into a paste and combined with some wine, reminds us of the mortar which the Jewish slaves used in their construction work. In ancient times, eating the Paschal lamb was the heart of the Seder service. Today, the table is like an altar and eating the meal in the right spirit becomes an act of worship.
Some families start the Passover meal with a boiled egg dipped in salt.
There are several explanations for this custom. Some say it was adopted from the Romans who started their meals with an hors d'oeuvres. Some say the egg is symbolic of Spring. Some say the egg replaces the special festival sacrifice which can no longer be offered since the destruction of the Temple in Jerusalem. And the salt water symbolizes our tears for the destruction of the Temple.