Although it is forbidden today to eat Lamb at the Seder meal (because we cannot be sure it is without spot, blemish or wrinkle without a revived priesthood), in the days of the Temple Hillel would make a sandwich of the Pesach lamb, matzah and maror in order to observe the law, "You shall eat it (the Pesach sacrifice) on matzah and maror.

Break the bottom matza, distribute it with bitter herbs dipped in charoset say: "You shall eat it on matzah and maror" and eat while reclining or leaning. on your left side.

haggadah Section: Koreich