Preheat oven to 180ºC.

In a small roasting dish place garlic, chillies and olive oil and cook until the garlic is very tender and the chillies have blackened, approx. 15-20 minutes. Remove from oven, cool completely and then blitz in a food processor.

To butterfly the prawns, use a serrated knife to slice through the back of the prawns from the head to tail. Remove the vein and open the prawns to lay flat.

Preheat grill pan or barbecue to high.

Place garlic, chilli and oil mixture into a bowl and add parsley and a pinch of salt and pepper. Toss to combine.

Brush prawns with chilli mix and cook flesh-side down for 1-2 minutes until red and lightly charred. Turn and continue cooking until cooked through. Remove from heat and sprinkle with lemon zest.

Squeeze over lemon juice and serve immediately.