This is actually the way to hang soup. Soups are divided into milk soup and clear soup. Milk soup is as white as milk. Clear soup is clear as water. What you asked was how to make milk soup. Cut the oxtail and blanch it. Take another pot of water and put it in oxtail. Bring the fire to the boil, and then simmer it. Pay attention to replenish enough water, and don't add water halfway. Don't let the fire be too small after boiling. Too small soup and water are mixed, and too large water evaporates quickly, so use medium and small fire. Hanging soup depends on the raw materials, and the soup hanging from oxtail will not meet the standard of milk soup.