Whether New York strip steak is kosher or not will depend primarily on the way the animal was slaughtered and processed. To be considered kosher, the animal must be slaughtered by a trained Jewish butcher called a shochet in a very precise manner as outlined by Jewish law. Additionally, certain parts of the animal are not considered kosher. The New York strip steak comes from the short loin area of the cow, which can be kosher. However, it requires the removal of certain nerves and fats, which might not have been done if the steak was not processed under kosher conditions. Therefore, to ensure the strip steak is kosher, it's best to look for meat that is explicitly marked as kosher-certified.