01 - Combine shrimp with olive oil, minced garlic, salt, pepper, and lemon zest in a bowl. Let marinate for 10 minutes while preheating grill to medium-high heat.
02 - Thread marinated shrimp onto skewers, reserving any remaining marinade.
03 - Melt butter with olive oil in a small saucepan over medium heat. Add capers and cook 1 minute. Pour in white wine and lemon juice; simmer 2 minutes until slightly reduced. Stir in parsley and remove from heat.
04 - Grill skewers 2-3 minutes per side until opaque and lightly charred. During the final minute, brush with piccata sauce.
05 - Arrange skewers on platter, drizzle with remaining piccata sauce, and sprinkle with extra parsley. Accompany with lemon wedges.