Combine all the ingredients for the pork - except the pork itself. Whisk together in a small bowl and set aside half the sauce for later.
Add the pork to the remaining sauce and make sure all the meat is covered, cover and let the meat marinate for at least 1-3 hours - the longer the better, overnight is ideal.
When youre ready to cook, pre-heat your grill to a medium heat, 180 degrees. Drain the pork and discard the marinade.
Place the slices of pork onto a shallow baking tray lined with foil. Cook for 15-20 minutes, basting 3 or 4 times throughout and flip half way through - until the pork becomes beautifully caramelised on both sides.
leave to cool slightly before serving with the spring onion, sesame seeds and a drizzle of the original marinde.