The entire story of the Haggadah is contained in the Seder plate; everything on it symbolizes an aspect of Exodus:
Zeroa, a roasted bone, beet or “Pashcal yam”. Evokes the offering made at the Temple in ancient times.
Beitza, a boiled egg, symbolizes the circle of life and death. Maror, a bitter herb, reminds us of the bitterness of enslavement.
Charoset, a mixture of fruit, nuts, wine and spices, represents the mortar our ancestors used to build the structures of Mitzrayim
Karpas, a green vegetable, symbolizes hope and renewal.
Chazeret, the bitter herb for the “sandwich” we eat later, following the custom established by Hillel the Elder, as a reminder that our ancestors “ate matzah and bitter herbs together” (20)
(All the items on the Seder plate also correspond to different kabbalistic sephirot)

haggadah Section: Commentary / Readings
Source: Love and Justice Haggadah