Step 1

Mince together the garlic, capers, and 1/2 teaspoon of the salt, and place in a small bowl. Stir in the mint, parsley, olive oil, lemon juice, and red-wine vinegar.

Step 2

Preheat the broiler or prepare a grill. Butterfly the shrimp by slicing down the center of each, lengthwise, almost but not completely through. Open both sides to lay flat. Season with the remaining 1/2 teaspoon of the salt and the pepper. Broil or grill for 2 minutes per side. Place 4 shrimp on each plate and spoon some of the sauce over them. Serve with lemon.