Slice up your pork and mix with the lemongrass, garlic, shallot, fish sauce, oyster sauce, sugar, soy, oil, salt and pepper in a bowl
Marinate at least 4 hours (overnight is recommended)
Thread pork onto skewers, scrunching slightly for juicy edges
Heat the oven to 190°C and cook for 15 minutes on each side
Grill for 2 minutes at the end to get the pork nicely caramelised
Whisk all nuoc cham ingredients until sugar dissolves
Serve skewers hot with dipping sauce, lettuce and herbs
