1) Matzah: The Matzah to be used at the Seder is called ‘Matzah Shemurah’, ‘Guarded Matzah’. This means that it has been protected from leavening due to: a) the Mitzvah to eat Matzah on the eve of Pesach; or b) the prohibition to eat Chometz during the entire Pesach.1
2) A folded part of Matzah may not be eaten. Instead the folded area is removed and discarded, together with a margin of close to an inch. This refers to a fold enclosing a hollow, the interior of which may have not been baked adequately.2 [The supervisor in the Matzah bakery should check for this problem, so it is unlikely that folded Shemurah Matzah should reach to the consumer].
3) Maror — Horseradish: Should be grated before Yom Tov. In case of need some allow ]on Yom Tov, not on Shabbos[ to grate in an unusual manner, e.g. upon a sheet of paper.3
4) Chazeres — Romaine Lettuce: Check carefully for bugs, allowing the light to shine through the leaves. Dry the leaves as much as possible so as not to wet the Matzah at Korech.
5) Wine: The general practice in Chabad is not to use grape-juice alone for Kiddush, Havdalah or the Four Cups, at least not the menfolk.
6) Zeroa: Our custom is to use the neck of a chicken. [One reason is because this portion has no resemblance to any part of a lamb, and thus serves to distance any impression that we are sacrificing a Korban Pesach outside the Beis HaMikdash].4 The Zeroa is roasted before Yom Tov, and before setting it on the Seder Plate we remove most of the meat. The Zeroa is not eaten at all.
7) Egg: Our custom is to have it hard-boiled.5
8) Charoses: To be prepared before Yom Tov. Our custom is not to add any wine to the mixture at this stage. Just before eating the Maror, a part of the Charoses is taken from the Kaara and mixed with the wine in the dish beneath the Kiddush cup. Thus the Charoses that remains on the Kaara contains no wine at all, and is used for Korech.6
9) The Meal: We do not serve roast meat or chicken at the Seder meal.7
