In some listings of the 613 biblical commandments, such as the Minchat Chinuch, the biblical obligation to consume maror is included within the commandment to consume the meat of the sacrificial pascal offering. Ever since the pascal offering ceased to exist with the destruction of the Temple in Jerusalem in 70 CE, the obligation to consume maror on the first night of Passover has been rabbinical in nature because the only biblical reference to the maror is the verse quoted above in which it is mentioned in reference to the offering. This is in contradistinction to the obligation to consume matzo on the first night of Passover, which remains a biblical commandment even in the absence of the pascal lamb, because there are other biblical verses that mention matzo as a standalone obligation (Exodus 12:18, Deuteronomy 16:8)
According to the Haggadah, the traditional text which is recited at the Seder and which defines the Seder's form and customs, the maror symbolizes the bitterness of slavery in Egypt. The following verse from the Torah underscores that symbolism: "And they embittered (ve-yimareru וימררו) their lives with hard labor, with mortar and with bricks and with all manner of labor in the field; any labor that they made them do was with hard labor" (Exodus 1:14).
Use at the Seder
Maror is one of the foods placed on the Passover Seder Plate and there is a rabbinical requirement to eat maror at the Seder. Hazeret (Hebrew: חזרת) is used for the requirement called korech, in which the maror is eaten together with matzo. There are various customs about the kinds of maror placed at each location.
During the Seder, each participant recites a specific blessing over the maror and eats it. It is first dipped into the charoset—a brown, pebbly mixture which symbolizes the mortar with which the Israelites bound bricks for the Egyptians. The excess charoset is then shaken off and the maror is eaten. The halakha (Jewish Law) prescribes the minimum amount of maror that should be eaten to fulfill the mitzvah (a kazayis or kayazit, literally meaning the volume of an olive) and the amount of time in which it should be consumed. To fulfill the obligation, the flavor of the maror must be unadulterated by cooking or preservatives, such as being soaked in vinegar.
Types of maror
The most common vegetables used as bitter herbs are horseradish and romaine lettuce. Romaine lettuce is not initially bitter, but becomes so after the first taste, which is symbolic of the experience of the Jews in Egypt. However, Wilde or Prickly Lettuce (Lactuca serriola), found in Israel, is a bitter vegetable that fits all descriptions of Chazeret in the Talmud. Other suitable vegetables include endive and charchavinah (variously identified as a vine growing around palms, a type of thistle, or a type of acacia), both of which are mentioned explicitly in the Mishna (Pesachim 2:6). Some Sephardic families use green onions or curly parsley. Although many Jews use Khreyn condiment (a mixture of cooked horseradish, beetroot and sugar) the Code of Jewish Law Shulchan Aruch requires that maror be used as is, that is raw, and not cooked or mixed with salt, vinegar, sugar, lemon, or beets.
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