Ask the butcher to cut the ribs into 1.5" to 2" long slices. Clean, rinse, pat the riblets dry.
Heat the pan to high. Add oil and pork riblets. Sear all sides. Turn down the heat to medium-high.
Add shaoxing, vinegar, sugar, soy sauce, water and mix. Coat the ribs with the sauce. Turn up the heat and bring to a boil. Cover with a lid and turn down to low-medium heat. Cook for 30 minutes.
Remove the lid and turn up the heat to medium. Cook the ribs uncovered for 5-8 minutes until the sauce reduces about a ~quarter. Make sure to frequently flip/rotate the ribs in the sauce while cooking.
Garnish with toasted sesame seeds and green onions.