This is the seder plate, and each food is symbolic for an aspect of Passover: A roasted shank bone represents the Pescah sacrifice, an egg represents spring and the circle of life, bitter herbs represent the bitterness of slavery, haroset (an applesauce-like mixture with wine, nuts, apples, etc.)

What is the significance of the Seder meal?

The Biblical Passover Seder festival meal was celebrated by Jews to commemorate the mercy of God sparing them from the plague of the death of the first-born son in Egypt and subsequent freedom from slavery.

What does lettuce represent on the seder plate?

In Ashkenazi tradition, fresh romaine lettuce or endives (both representing the bitterness of the Roman invasions) or horseradish may be eaten as Maror in the fulfilment of the mitzvah of eating bitter herbs during the Seder.