Add the prawns and the chopped parsley to the mixture and toss well to coat.
Preheat oven to 500°F.
Place prawns with the marinade in a large, heavy skillet (large enough to fit prawns in a single layer or cook in batches) and place in oven.
In about 2 to 3 minutes, shake the pan to ensure even cooking and repeat in another 2 to 3 minutes.
At this point the mixture should be bubbling and the prawns will be turning opaque.
Transfer the pan to a stovetop, over medium heat and begin adding the butter in 1 to 2 tbsp increments, shaking the pan the entire time, allowing the butter to emulsify into the mixture before adding any more butter.
This process should take about 4 to 5 minutes.
When completed, pour onto a platter and serve immediately with plenty of good, crispy bread.