Cut the ribs into pieces of 10cm long (shorter or longer as you like...)

Put the ribs in to cold water, till boiling cook for 5 min. then take the ribs out.

Add 1tbsp cooking oil and rock sugar in the wok, sir-fry till sugar melts and turn to amber color.

Add pork ribs, stir-fry on medium heat until the ribs begins to brown. add soy sauce, wine, ginger and vinegar.

Pour 600ml of hot water into the wok, turn down the heat, cover and simmer for 1.5hrs.

After 1.5hrs. lid off and turn up the heat to concentrate the sauce. when sauce became thicker, add 1tbsp black rice vinegar. stir fry for 30 sec. Sprinkle with sesame seeds before serving.