The Passover Seder is one of the most important celebrations on the Jewish cultural calendar.
It provides a setting of family love and unity in which all Jews can rededicate themselves to the ideal of human freedom and growth.

The ritual of the occasion involves the use of certain symbolic foods:

P'RI HA-GAPHEN - "the fruit of the vine" - wine or grape juice
MATSAH - unleavened bread
MAROR - a bitter herb (horseradish, green onion, or romaine lettuce)
KARPAS - parsley or celery
Z'ROA - an animal bone or a beet (for vegetarians)
BEITSAH - an egg, hard-boiled then roasted
TAPPUZ - an orange (a recent addition)
HAROSET - a condiment made from fruits, nuts, spices, and wine 

haggadah Section: Introduction
Source: Machar