Cheese of Islam and Judaism must avoid cheeses made with rennet from animals not slaughtered in a manner adhering to halal or kosher laws. Both faiths allow cheese made with vegetable-based rennet or with rennet made from animals that were processed in a halal or kosher manner. Many less orthodox Jews also believe that rennet undergoes enough processing to change its nature entirely and do not consider it to ever violate kosher law. (See "Cheese and kashrut".) As cheese is a dairy food, under kosher rules it cannot be eaten in the same meal with any meat. Rennet derived from animal
Leyden cheese Leyden cheese Leyden, from , is a semi-hard, cumin and caraway seed flavoured cheese made in the Netherlands from cow's milk. It is made both in factories and on farms, historically in the Leiden area. "Leidse kaas" is the most common type of "komijnekaas"—cheese including cumin as an ingredient—in the Netherlands. The cheese is round and flat like Gouda however it is made with sharp edges on one side and less roundness to its side. It has a fat percentage of 30% to 40%, and can weigh between and . On the farms, about 5% of buttermilk may be added