Prepare glaze by placing all ingredients into a Thermo bowl and blend 10 sec/speed 10.
Pour over the prawns and allow to marinate for 2 hours.
Brush BBQ or flat grill plate with oil and heat on a medium heat until just smoking.
Cook prawns and serve sprinkled with coriander and additional marinade.
Grill a couple of mandarin halves cut side down and serve on the side.