Gid hanasheh


Gid Hanasheh, often translated as "displaced tendon," is the term for sciatic nerve in Judaism. It may not be eaten by Jews according to Halacha. The laws regarding the prohibition of gid hanasheh are found in Tractate Chullin, chapter 7.

Interpretations

The Zohar explains that the thigh is the root location of sexual desire. While most evil urges can be overcome, there is one lust that is so strong that it overpowers even great men - the gid ha-nasheh. Its very name nasheh means “forgetting”, because once this desire has been aroused, we forget all rational thinking and moral scruples. The only way to win this battle is to completely distance ourselves from it. For this reason, the gid ha-nasheh is not eaten at all but entirely avoided.
Rabbi Abraham Isaac Kook explained that the prohibition of eating gid ha-nasheh demonstrates that, while we may need to slaughter animals for our physical needs, we do not seek to subjugate others, whether man or beast. For this reason, we make great efforts to avoid eating the sciatic nerve - a nerve that allows the body to stand upright.

Removal

The removal of the gid hanasheh and chelev is called nikkur. Since it is labor-intensive to remove all the forbidden parts of the hindquarters of an animal, the entire hindquarters are usually sold to the non-kosher market outside of Israel and a few other markets with sufficient Jewish populations to justify the expense.
In the situation of a ben pekuah the nerve is permitted to be eaten. This potential reduction in expense is part of a project that began in Melbourne to create a herd of ben pekuah animals.