Wikipedia Article About Leyden on Wikipedia Leidse cheese, which is also known as Komijnekaas or Boeren-Leidsekaas in Dutch, is a spiced cheese made in the Netherlands from partly skimmed cow's milk to which color is added. It is made both in factories and on farms, historically in the Leiden area. The factory cheese is round and flat like Gouda, but sometimes it is made with sharp edges on one side. It is imported into the United States in different sizes, some cheeses weighing about 8 pounds (3.6 kg) and others as much as 16 to 20 pounds (7 to 9 kg).