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In page Kashrut:

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The laws of kashrut can be classified according to the origin of the prohibition (Biblical or rabbinical) and whether the prohibition concerns the food itself or a mixture of foods.[1] Biblically prohibited foods include:[1]

  • Blood (dam)—the blood of kosher mammals and fowl is removed through salting, with special procedures for the liver, which is very rich in blood.[6]
  • Particular fats (chelev)—particular parts of the abdominal fat of cattle, goats and sheep must be removed by a process called nikkur.[citation needed]
  • The twisted nerve (gid hanasheh)—the sciatic nerve, as according to Genesis 32:32 the patriarch Jacob's was damaged when he fought with an angel, so may not be eaten and is removed by nikkur.[citation needed]