01 - In a medium bowl, combine the parsley, cilantro, minced garlic, red wine vinegar, olive oil, dried oregano, red pepper flakes, kosher salt, black pepper, and lemon zest. Stir thoroughly until all ingredients are evenly incorporated.
02 - Transfer 1/4 cup of the chimichurri to a small bowl and set aside for finishing the dish.
03 - Place the peeled and deveined shrimp in a separate bowl. Pour the remaining chimichurri sauce over the shrimp and toss to coat evenly. Allow to marinate for 10 to 15 minutes at room temperature.
04 - Heat a grill pan or large skillet over medium-high heat until a drop of water sizzles on contact.
05 - Thread the shrimp onto skewers if grilling, or place them directly in the pan. Cook for 2 to 3 minutes per side until the shrimp turn pink and are just cooked through. Avoid overcooking to maintain tenderness.
06 - Remove the shrimp from heat and transfer to a serving platter. Drizzle with the reserved chimichurri sauce and garnish with lemon wedges and additional chopped parsley as desired.