Mix the sesame seeds with salt.
Place the spring onions, lemongrass, sugar, black pepper, vegetable oil, fish sauce, honey, and oyster sauce in a mixing bowl and stir to combine. Add the pork, toss to coat, then cover and marinate in the refrigerator overnight.
Preheat a grill. Thread the pork onto bamboo skewers and char grill each side for 3 minutes.
Dip into sesame salt.