Preparations: 

• Preheat the oven to 190°C, position a rack in the middle of the oven, and line a baking sheet with a large piece of foil. Spray it lightly with cooking spray.
• To make the sauce, in a bowl, whisk together the melted butter, garlic, lemon juice, salt and pepper.
• Place the side of trout on the foil, and spoon the sauce over the top of the fish.
• Fold the sides of the foil to cover and seal the foil packet, but not tightly so the top of the foil does not touch the sauce too much.
• Bake in the oven for 15-20 minutes or until the thickest part of the fish is cooked through and can be easily flaked with a fork. The cooking time depends on the thickness of the fish.
• Remove from the oven and carefully open the foil. Place under the grill for a couple of minutes to lightly brown the top, then allow to rest before slicing and serve with chopped parsley and lemon slices.