Using a sharp knife, butterfly the shrimp by splitting them down the middle - but not all the way through, leaving the tails intact (the original recipe said to just use kitchen scissors and cut them down the middle and leave the tails intact. . up to you which method to use).
Lay the shrimp in a single layer in a large shallow dish. In small bowl, mix remaining ingredients, except lemon wedges. Pour over shrimp and let marinate for 2 hours.
Preheat broiler. Broil shrimp for 4 minutes or until pink. Serve with lemon wedges.