Mix together the spring onions, carrot, lettuce and beansprouts in a bowl.
Add the soy sauce, lime juice, sesame oil and seeds, then mix everything together until combined. Leave this to marinate for 30 minutes.
Cover the pork loins with the teriyaki marinade, cover and leave to marinate as well.
Meanwhile, heat the barbecue until the coals are grey, or heat a gas barbecue to medium. Cook the pork on the barbecue for 12-15 minutes, turning halfway through, until cooked through.
Arrange the coleslaw on 4 plates. Slice the pork and serve on top of the coleslaw, garnished with the reserved spring onion and carrot.