The kaarah is assembled at night, before beginning the Seder.
If possible, choose concave (bowl-shaped) matzos for the Seder plate.
To avoid any similarity to the korban pesach, the Frierdiker Rebbe would remove almost all the meat from the zeroa bone (although it was from a chicken, which is invalid for a korban to begin with).
It is our custom to use both lettuce and horseradish for both maror and chazeres. To prevent the matzah from becoming wet (sheruyah), the chazeres should be completely dry.
We use a raw onion (or cooked potato) for karpas.
Place the zeroa on the top of the kaarah to the right, and the beitzah opposite it to the left. Place the maror beneath them in the center. Place the charoses beneath the zeroa, the karpas beneath the beitzah, and the chazeres beneath the maror.
