Combine all ingredients in a large bowl.
Using your hands, massage the pork chops in the marinade until fully combined. Allow the meat to relax in the marinade overnight or up to 24 hours.
You will have leftover marinade mix including sesame seeds, lemongrass and shallot. You don't want to waste these tasty bits as they'll fall through the barbecue when grilling. Save these for later as we'll fry them to make a crispy topping.
Grill the meat on a barbecue on low to medium heat with the lid closed for most of the time in order to keep the meat moist. Flip the pork chops once the meat has developed a sear and is evenly caramelized on one side.
Once the pork is cooked through, transfer the meat onto a serving platter.
In a skillet over medium heat, add the leftover marinade mixture and cook for 3-4 minutes until caramelized and crunchy. Sprinkle Thit Nuong with crunchy lemongrass and sesame seed mixture.
Serve Vietnamese Grilled Pork with rice noodles, steamed jasmine rice, or inside a baguette along with all the fixings—fresh mint, shredded lettuce, sliced cucumbers, pickled carrots and daikon, toasted peanuts, scallion oil, fried shallots, and nuoc cham or Thai sweet chili sauce.