1) Remove the shell and clean prawns.
2) Remove their vein and drain on a paper towel after rinsing well.
3) Mix together rest of the ingredients.
4) In a 13 x 9" pyrex dish, arrange the prawns, covering with marinade.
5) Place them in refrigerator for 2 or more hours.
6) Take a large shallow casserole and preheat it with enough marinade to cover bottom of dish.
7) Stir in prawns and broil them for 3 - 4 minutes until prawns are soft, tossing occasionally. Ensure not to overcook.