Maror

Hello,

The vegetable one uses for Maror (bitter herb) at the Seder should be a leaf or stem, should be something that grows more bitter as the season goes on, and if it's a leaf then it may not be dried out. It may not be cooked or pickled.

The best type of Maror is a bitter lettuce, because it has all of these characteristics and is recommended first in the Talmud. However, one must be very careful to check it for bugs, since there are several biblical prohibitions against eating bugs.

(Code of Jewish Law Orach Chaim 473:5; Mishneh Berurah 473:42)

Have a great day,
Mordechai