Kashrut

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Kashrut (also kashruth or kashrus, כַּשְׁרוּת‎) is a set of dietary laws dealing with the foods that Jewish people are permitted to eat and how those foods must be prepared according to Jewish law. Food that may be consumed is deemed kosher (/ˈkoʊʃər/ in English, Yiddish: כּשר), from the Ashkenazi pronunciation of the term that in Sephardi or Modern Hebrew is pronounced kashér (כָּשֵׁר‎), meaning "fit" (in this context: "fit for consumption"). Food that may not be consumed, however, is deemed treif (/treɪf/ in English, Yiddish: טרײף), also spelled treyf (Yiddish: טריף). In case of objects the opposite of kosher is pasúl (/pəˈsul/ in English, Yiddish: פָּסוּל)

Although the details of the laws of kashrut are numerous and complex, they rest on a few basic principles:

• Only certain types of mammals, birds, and fish, meeting specific criteria are kosher; the consumption of the flesh of any animals that do not meet these criteria, such as pork, frogs, and shellfish, is forbidden, except for locusts, which are the only kosher invertebrate.^[1]
• The most basic eating rule in the Torah is that blood is not to be consumed; therefore, as a step to being kosher, mammals and birds must be slaughtered according to a process known as shechita, in which a certified ritual slaughterer, called a shochet, severs the trachea, esophagus, carotid arteries, and jugular veins in a single, quick cut using an ultra-sharp instrument called a chalaf; doing so causes rapid and massive blood loss.
• The meat must still go through a process known as koshering or kashering to be considered fit for consumption. The three approved methods are broiling, roasting, and soaking & salting.
• Meat and meat derivatives may never be mixed with milk and milk derivatives. Separate equipment for the storage and preparation of meat-based and dairy-based foods must be used.

Every food that is considered kosher is also categorized as follows:

• Meat products, (also called b'sari or fleishig), are those that contain kosher meat, such as beef, lamb, or venison; kosher poultry, such as chicken, goose, duck, or turkey; or derivatives of meat such as animal gelatin; additionally, non-animal products that were processed on equipment used for meat or meat-derived products must also be considered as meat (b'chezkat basar).
• Dairy products, (also called c'halavi or milchig), contain milk or any derivatives such as butter or cheese; additionally, non-dairy products that were processed on equipment used for milk or milk-derived products must also be considered as milk (b'chezkat chalav).
• Pareve (also called parve, parveh; meaning "neutral"), products contain neither meat, milk, nor their respective derivatives; they include foods such as kosher fish, eggs from permitted birds, grains, produce, and other edible vegetation. They remain pareve if they are not mixed with or processed using equipment that is used for any meat or dairy products.

While any produce that grows from the earth, such as fruits, grains, vegetables, and mushrooms, is always permissible, laws regarding the status of certain agricultural produce, especially that grown in the Land of Israel such as tithes and produce of the Sabbatical year, impact their permissibility for consumption.

Most of the basic laws of kashrut are derived from the Torah's books of Leviticus and Deuteronomy. Their details and practical application, however, are set down in the Oral Torah, (eventually codified in the Mishnah and Talmud), and elaborated on in the later rabbinical literature. Although the Torah does not state the rationale for most kashrut laws, some suggest that they are only tests of obedience,^[2] while others have suggested philosophical, practical, and hygienic reasons.^[3][4][5]

Over the past century, many kashrut certification agencies have started to certify products, manufacturers, and restaurants as kosher, usually authorizing the use of a proprietary symbol or certificate, called a hechsher, to be displayed by the food establishment or on the product, which indicates that they are in compliance with the kosher laws. This labeling is useful for many people, a few examples including those whose religions expect adherence to a similar set of dietary laws, people with allergies to dairy foods, or vegans, who use the various kosher designations to determine whether a food contains meat or dairy-derived ingredients.

The laws of Kashrut are a major area covered in traditional rabbinic ordination; see Yeshiva § Jewish law and Semikhah § Varieties of ordination. And numerous scholarly and popular works exist on these topics,^[6] covering both practice and theory.