Some say that it has no special meaning, being just a container for the meaningful items. Others say that the plate itself represents Malchut (God's kingship).
Seder = סדר
The seder dish is the dish which is used to hold the traditional foods of the Seder meal.The highlight of Passover is the Seder meal. This meal is of great importance in Judaism. It is a 3325-year old continuous tradition that began on the night of the Exodus from Egypt (see Exodus chapter 12), and is fully detailed in our ancient Oral Traditions (Talmud, chapter Arvei Pesachim).The Seder meal is one of those occasions, like Yom Kippur and Hanukkah, that Jews all over the world, Orthodox and non-Orthodox alike, observe in common. During the Seder, we keep the essential mitzva and customs of handing Jewish traditions down to the next generation, with the traditional Seder foods and the ceremony of reading the Passover Haggadah which retells the events of the Exodus.During the Seder meal, there are other traditional foods in addition to the matzah: bitter herbs, wine, parsley, and haroset (a mixture of apples, cinnamon, wine and nuts).
In the seder meal the parsley, or other type of bitter herb, represents the bitter taste of slavery and affliction. In some homes parsley is used because it looks similar to a flail.
night of passover
No. A Seder is a Jewish religious meal recalling the Passover.
Sometimes.
Four glasses of wine are drunk as part of the seder.
At the Seder meal we retell the story of the Exodus from Egypt.
Generally it occurs only during Passover, a Jewish holiday. There is also a seder for the holiday of Tu Bishvat, but this seder is rarely observed.
One of the foods on the Seder plate is the Z'roa - a roasted shank-bone of lamb or goat, or a chicken wing, or chicken neck. It symbolizes the korban Pesach (Pesach sacrifice), which was a lamb that was offered in the Temple in Jerusalem, then roasted and eaten as part of the meal on Seder night. See also:More abut the Seder meal
At sundown.
The parsley is a green vegetable, representing spring-time and renewal; during the seder, it is dipped into salt water, to represent the tears the Israelites cried while living as Egyptian slaves.