[Then] they bring [it] before him; he eats dipped lettuce before he reaches the course that is secondary to the matzah. [Now] they brought before him matzah, lettuce, and charoses, and two cooked dishes; although charoses is not a mitzvah.  R' Eliezer bar R' Tzadok says: [The dipping is] a mitzvah.  And in the Temple they would bring before him the body of the pesach-[offering].

They pour him a second cup [of wine]; and here the son asks of his father And if the son has not [enough] understanding, his father instructs him [to ask]: “Why is this night different from all nights? —- On all nights we eat chametz and matzah, but this night only matzah. On all nights we eat other greens, but on this night bitter herbs. On all nights we eat meat roasted, stewed, or cooked, but on this night only roasted. On all nights we might eat dipped vegetables once, but on this night twice.”  And according to the intelligence of the son his father instructs him. He begins with the disgrace and concludes with the glory, and he expounds from: The Aramean sought to disgrace my father (Deut. 26:5) until he ends the whole portion.