1. Preparation materials: pork, yam, ginger, star anise, cinnamon, fragrant leaves and rock sugar
2. Cut the pork into large sections, add ginger into the cold water pot, boil for a few minutes to drain the blood
3. Wash the cooked streaky pork with warm water, dry the surface with kitchen paper and cut into small pieces (washing with warm water will not make the meat hot and cold, and the taste will become firewood, and the cooked meat will be easier to cut)
4. Pour a little vegetable oil into the pot and stir fry the pork until the oil comes out (there is no need for too much oil in the pot, the pork itself will produce oil, stir fry for a period of time, the fat meat oil will fry out, it will not be so greasy, but the frying time should not be too long, and the meat will become firewood after a long time.)
5. Turn to medium and low heat, continue to add rock sugar, stir fry until the pork is colored
6. Add cooking wine, soy sauce, soy sauce, ginger slices, star anise, cinnamon, fragrant leaves and salt into the pot, and boil them in hot water for about 1 hour until the pork is soft and rotten
7. Peel the yam and cut the hob block in water for standby (immersion in water can prevent oxidation)
8. After the pork is soft and rotten, add yam and continue to stew until the yam is soft and rotten
9. Finally, the juice can be collected at high temperature (the juice collection will make the taste more intense and make the color more beautiful)