It is best to eat bone hotpot in winter. Pig tubular bone is also called pig big bone and bonzi bone, and all parts of the pig have nutrition, which not only contains some protein, iron, calcium, phosphorus, vitamins and various trace elements necessary for human body. Moreover, the bone marrow in bones contains collagen, which can not only promote wound healing, but also enhance physical fitness. When cooking bone soup, adding a few drops of white vinegar can better dissolve the phosphorus and calcium in the bone into the soup for easy absorption.