Jews have been eating kosher food since biblical times.
Jews who eat kosher foods trace the rules for the food back to the book of Leviticus, which spells out what foods are allowable and ensure that they are kosher. .
Kosher animals
Meat from sheep is kosher
Leviticus 11:3-8 states that animals that both chew their cud and have a cloven hoof--among them oxen, sheep and goats--are clean. Animals that live in water are kosher if they have both fins and scales.
There has been much debate about animal products, such as dairy, but dairy products are generally deemed kosher if they come from a clean animal.
Unkosher Animal Parts
Jews are prohibited from consuming blood . To avoid this, meat is soaked in water and thickly covered in salt. The salt draws the blood out of the meat, which is washed twice more.
This technique is insufficient to remove blood from organs. If organs are to be eaten, they are roasted as this discharges blood.
Meat from a clean animal can be nonkosher if it incorrectly killed. Slaughter must not make the animal suffer unnecessarily.
Nonkosher Food
The main reason for food being nonkosher is that it has come from nonkosher animals. For meat to be kosher, it must have been ritually slaughtered. Other nonkosher actions include serving dairy and meat together; a non-Jew producing wine or people using utensils that have previously been used for something nonkosher.
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