There are many kinds of tendon, and the texture of dry tendon is very hard, especially the tendon is old and thick. Therefore, before the hair is made, it must be beaten with a mallet to make it soft, easy to swell after being heated, and the finished product is crisp and hard. The general process of making tendons with water is: first, wash the beaten tendons with water, put them in a container, add water and steam them in a cage for 4 hours. Then soak in cold water for 2 hours, then add water, onion, ginger, yellow wine, etc., steam until soft and hard, take it out and put it in cold water to continue soaking. At this time, the tendon is a semi-finished product.