Yak Cheese Chews contain a mixture of yak and cow milk. Once the mixture is boiled, the prevalent fat is separated by adding lime juice. The excess fat is then discarded. After a few hours of boiling the milk, it starts to thicken and forms a white cheese. Stirring the boiling milk gently and continuously is key to making this cheese. The cheese is poured into a clean cloth to drain out the excess water. Once the block of cheese is ready, it is cut into small pieces and dried. When the product is ready, it can be stored for a number of years. No preservative or artificial flavors are added in the whole process of making the product.