Nøkkelost (Norwegian: "key cheese"), also seen in Swedish spelling as Nökkelost and sometimes called kuminost (cumin cheese), is a Norwegian cheese flavored with cumin, caraway seeds and cloves. It is semi-hard, yellow, and made from cow's milk. It is made in the shape of wheels or blocks. Nøkkelost cheese is a factory-made variation of Leiden cheese, and has been made since the 17th century. Its period of maturation is three months. Nøkkelost is expensive and somewhat rare.