1. The Mishnah lists the vegetables which may be used to fulfill the Mitzvah of Maror.
2. The Mishnah discusses how one must eat these vegetables.
3. It is preferable to use lettuce for the Mitzvah of Maror.
4. The Egyptians are compared to Maror.
5. Grains used for chicken feed may not be soaked, since they might become Chametz.
A BIT MORE
1. The first two on the list are lettuce and beets.
2. One may eat them dry or moist, but he may not eat them if they have been cooked or pickled. One may also fulfill the Mitzvah by eating their roots.
3. The Gemara explains that lettuce in Aramaic is "Chasa," implying that Hashem was "Chas" (had mercy) on us.
4. Just as Maror is at first soft and later hardens, the Egyptians were at first soft with us when they offered us pay in return for our work, and they later hardened and forced us to work in return for no compensation at all.
5. Similarly, it is forbidden to chew grain in order to put it on a wound, since it will become Chametz.