A piece of roasted meat represents the lamb that was the special Paschal sacrifice on the eve of the exodus from Egypt, and annually, on the afternoon before Passover, in the Holy Temple...
A hard-boiled egg represents the holiday offering brought in the days of the Holy Temple. The meat of this animal constituted the main part of the Passover meal...
Bitter herbs (maror) remind us of the bitterness of the slavery of our forefathers in Egypt. Fresh grated horseradish, romaine lettuce, and endive are the most common choices...
A non-bitter root vegetable alludes to the back-breaking work of the Jews as slaves. The Hebrew letters of karpas can be arranged to spell "Perach Samech"...
The lettuce symbolizes the bitter enslavement of our fathers in Egypt. The leaves of Romaine lettuce are not bitter, but the stem, when left to grow in the ground, turns hard and bitter...