Naje a slit down the back of each prawn and open out into butterflies.
In a bowl, mix together the remaining ingredients until well blended.
Add the prawn, turn to coat well then leave to marinate for 1 hour.
Preheat the grill for 5 minutes.
Put the prawns together with their marinate, to a shallow ovenproof dish (large enough to take them in one layer).
Grill for 10-15 minutes, turning and basting several times during the cooking.
The prawns are ready to serve.
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