Place all ingredients (except prawns) in a large resealable bag. Shake sealed bag to combine. Add shrimp and shake to coat. Marinate for 1 hour in refrigerator. Remove and place on skewers.
Preheat grill for high heat. Lightly oil grill grate. Place the skewers on the preheated grill for 1-2 minutes per side, or until nearly cooked through (prawns will continue to cook for a minute or two after removing from heat).