1In a small bowl, combine the chopped parsley, olive oil, lemon juice, salt, and pepper to create the herb marinade.
Place the trout fillets in a shallow dish and pour the marinade over them, ensuring they are well coated. Let them marinate for at least 15 minutes.
Preheat the grill to medium-high heat.
Once the grill is hot, place the marinated trout fillets on the grill, skin side down.
Grill the trout for about 4-5 minutes on each side, or until the fish flakes easily with a fork.
Remove the trout from the grill and serve immediately, garnished with additional parsley if desired.