01 - In a medium bowl, combine the parsley, cilantro, garlic, red wine vinegar, olive oil, oregano, red pepper flakes, kosher salt, black pepper, and lemon zest. Stir thoroughly until all ingredients are evenly incorporated.
02 - Measure out 1/4 cup of the prepared chimichurri and set aside for finishing the dish.
03 - Place the peeled and deveined shrimp in a separate bowl and pour the remaining chimichurri over them. Toss to coat evenly and let marinate for 10 to 15 minutes at room temperature.
04 - Set a grill pan or large skillet over medium-high heat and allow it to get thoroughly hot before adding the shrimp.
05 - Thread the marinated shrimp onto skewers if grilling, or place them directly into the hot 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.