Set it aside on the counter for at least 30 minutes to let the flavors mingle.
Make the marinade by combining the olive oil, lemon juice, garlic, sea salt, and freshly cracked pepper to taste in a large zip-lock bag. Add the peeled and deveined shrimp and mix until evenly coated in the marinade; set aside to marinate for 15 minutes.
Preheat a grill pan over medium-high heat or heat a grill to medium-high.
Skewer the shrimp onto skewers 5-6 at a time.
Grill the shrimp by placing the skewers on the hot grill pan and grilling for 2-3 minutes per side, depending on the shrimp size, until the outside is pink and the inside is just opaque. Remove from the grill to a serving plate.
Serve the shrimp by slathering each hot skewer with the well-mixed chimichurri sauce straight from the grill pan.
Serve immediately with additional chimichurri sauce on the side. Enjoy.